Merge pull request #13349 from jasontedor/predicate-out-with-the-old-in-with-the-new

Remove and forbid the use of com.google.common.base.Predicate(s)?

core/src/main/java/org/elasticsearch/action/admin/indices/mapping/get/TransportGetFieldMappingsIndexAction.java

@@ -19,8 +19,6 @@
 
 package org.elasticsearch.action.admin.indices.mapping.get;
 
-import com.google.common.base.Predicate;
-import com.google.common.collect.Collections2;
 import com.google.common.collect.ImmutableMap;
 import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.action.admin.indices.mapping.get.GetFieldMappingsResponse.FieldMappingMetaData;
@@ -51,8 +49,10 @@ import org.elasticsearch.threadpool.ThreadPool;
 import org.elasticsearch.transport.TransportService;
 
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Iterator;
+import java.util.stream.Collectors;
 
 import static org.elasticsearch.common.util.CollectionUtils.newLinkedList;
 
@@ -96,14 +96,10 @@ public class TransportGetFieldMappingsIndexAction extends TransportSingleShardAc
             typeIntersection = indexService.mapperService().types();
 
         } else {
-            typeIntersection = Collections2.filter(indexService.mapperService().types(), new Predicate<String>() {
+            typeIntersection = indexService.mapperService().types()
-
+                    .stream()
-                @Override
+                    .filter(type -> Regex.simpleMatch(request.types(), type))
-                public boolean apply(String type) {
+                    .collect(Collectors.toCollection(ArrayList::new));
-                    return Regex.simpleMatch(request.types(), type);
-                }
-
-            });
             if (typeIntersection.isEmpty()) {
                 throw new TypeMissingException(shardId.index(), request.types());
             }

core/src/main/java/org/elasticsearch/cluster/metadata/IndexNameExpressionResolver.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.cluster.metadata;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.ElasticsearchParseException;
 import org.elasticsearch.action.IndicesRequest;
 import org.elasticsearch.action.support.IndicesOptions;
@@ -50,8 +49,8 @@ import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.Callable;
+import java.util.stream.Collectors;
 
-import static com.google.common.collect.Maps.filterEntries;
 import static com.google.common.collect.Maps.newHashMap;
 
 public class IndexNameExpressionResolver extends AbstractComponent {
@@ -600,12 +599,11 @@ public class IndexNameExpressionResolver extends AbstractComponent {
                 } else {
                     // Other wildcard expressions:
                     final String pattern = expression;
-                    matches = filterEntries(metaData.getAliasAndIndexLookup(), new Predicate<Map.Entry<String, AliasOrIndex>>() {
+                    matches = metaData.getAliasAndIndexLookup()
-                        @Override
+                            .entrySet()
-                        public boolean apply(@Nullable Map.Entry<String, AliasOrIndex> input) {
+                            .stream()
-                            return Regex.simpleMatch(pattern, input.getKey());
+                            .filter(e -> Regex.simpleMatch(pattern, e.getKey()))
-                        }
+                            .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
-                    });
                 }
                 for (Map.Entry<String, AliasOrIndex> entry : matches.entrySet()) {
                     AliasOrIndex aliasOrIndex = entry.getValue();

core/src/main/java/org/elasticsearch/cluster/metadata/MetaData.java

@@ -22,8 +22,6 @@ package org.elasticsearch.cluster.metadata;
 import com.carrotsearch.hppc.ObjectHashSet;
 import com.carrotsearch.hppc.cursors.ObjectCursor;
 import com.carrotsearch.hppc.cursors.ObjectObjectCursor;
-import com.google.common.base.Predicate;
-import com.google.common.collect.Collections2;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.UnmodifiableIterator;
 import org.apache.lucene.util.CollectionUtil;
@@ -74,8 +72,11 @@ import java.util.Map;
 import java.util.Set;
 import java.util.SortedMap;
 import java.util.TreeMap;
+import java.util.stream.Collectors;
 
-import static org.elasticsearch.common.settings.Settings.*;
+import static org.elasticsearch.common.settings.Settings.readSettingsFromStream;
+import static org.elasticsearch.common.settings.Settings.settingsBuilder;
+import static org.elasticsearch.common.settings.Settings.writeSettingsToStream;
 
 public class MetaData implements Iterable<IndexMetaData>, Diffable<MetaData>, FromXContentBuilder<MetaData>, ToXContent {
 
@@ -382,10 +383,11 @@ public class MetaData implements Iterable<IndexMetaData>, Diffable<MetaData>, Fr
             }
 
             // TODO: make this a List so we don't have to copy below
-            Collection<IndexWarmersMetaData.Entry> filteredWarmers = Collections2.filter(indexWarmersMetaData.entries(), new Predicate<IndexWarmersMetaData.Entry>() {
+            Collection<IndexWarmersMetaData.Entry> filteredWarmers =
-
+                    indexWarmersMetaData
-                @Override
+                            .entries()
-                public boolean apply(IndexWarmersMetaData.Entry warmer) {
+                            .stream()
+                            .filter(warmer -> {
                                 if (warmers.length != 0 && types.length != 0) {
                                     return Regex.simpleMatch(warmers, warmer.name()) && Regex.simpleMatch(types, warmer.types());
                                 } else if (warmers.length != 0) {
@@ -395,9 +397,9 @@ public class MetaData implements Iterable<IndexMetaData>, Diffable<MetaData>, Fr
                                 } else {
                                     return true;
                                 }
-                }
+                            })
+                            .collect(Collectors.toCollection(ArrayList::new));
 
-            });
             if (!filteredWarmers.isEmpty()) {
                 mapBuilder.put(index, Collections.unmodifiableList(new ArrayList<>(filteredWarmers)));
             }

core/src/main/java/org/elasticsearch/cluster/routing/RoutingNodes.java

@@ -21,7 +21,6 @@ package org.elasticsearch.cluster.routing;
 
 import com.carrotsearch.hppc.ObjectIntHashMap;
 import com.carrotsearch.hppc.cursors.ObjectCursor;
-import com.google.common.base.Predicate;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Iterators;
 import org.apache.lucene.util.CollectionUtil;
@@ -40,6 +39,7 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.function.Predicate;
 
 import static com.google.common.collect.Maps.newHashMap;
 import static com.google.common.collect.Sets.newHashSet;
@@ -294,7 +294,7 @@ public class RoutingNodes implements Iterable<RoutingNode> {
         List<ShardRouting> shards = new ArrayList<>();
         for (RoutingNode routingNode : this) {
             for (ShardRouting shardRouting : routingNode) {
-                if (predicate.apply(shardRouting)) {
+                if (predicate.test(shardRouting)) {
                     shards.add(shardRouting);
                 }
             }

core/src/main/java/org/elasticsearch/cluster/routing/RoutingTable.java

@@ -20,8 +20,6 @@
 package org.elasticsearch.cluster.routing;
 
 import com.carrotsearch.hppc.IntSet;
-import com.google.common.base.Predicate;
-import com.google.common.base.Predicates;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.UnmodifiableIterator;
@@ -39,6 +37,7 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
+import java.util.function.Predicate;
 
 import static com.google.common.collect.Maps.newHashMap;
 
@@ -184,19 +183,8 @@ public class RoutingTable implements Iterable<IndexRoutingTable>, Diffable<Routi
         return allSatisfyingPredicateShardsGrouped(indices, includeEmpty, includeRelocationTargets, ASSIGNED_PREDICATE);
     }
 
-    private static Predicate<ShardRouting> ACTIVE_PREDICATE = new Predicate<ShardRouting>() {
+    private static Predicate<ShardRouting> ACTIVE_PREDICATE = shardRouting -> shardRouting.active();
-        @Override
+    private static Predicate<ShardRouting> ASSIGNED_PREDICATE = shardRouting -> shardRouting.assignedToNode();
-        public boolean apply(ShardRouting shardRouting) {
-            return shardRouting.active();
-        }
-    };
-
-    private static Predicate<ShardRouting> ASSIGNED_PREDICATE = new Predicate<ShardRouting>() {
-        @Override
-        public boolean apply(ShardRouting shardRouting) {
-            return shardRouting.assignedToNode();
-        }
-    };
 
     // TODO: replace with JDK 8 native java.util.function.Predicate
     private GroupShardsIterator allSatisfyingPredicateShardsGrouped(String[] indices, boolean includeEmpty, boolean includeRelocationTargets, Predicate<ShardRouting> predicate) {
@@ -210,7 +198,7 @@ public class RoutingTable implements Iterable<IndexRoutingTable>, Diffable<Routi
             }
             for (IndexShardRoutingTable indexShardRoutingTable : indexRoutingTable) {
                 for (ShardRouting shardRouting : indexShardRoutingTable) {
-                    if (predicate.apply(shardRouting)) {
+                    if (predicate.test(shardRouting)) {
                         set.add(shardRouting.shardsIt());
                         if (includeRelocationTargets && shardRouting.relocating()) {
                             set.add(new PlainShardIterator(shardRouting.shardId(), Collections.singletonList(shardRouting.buildTargetRelocatingShard())));
@@ -225,11 +213,11 @@ public class RoutingTable implements Iterable<IndexRoutingTable>, Diffable<Routi
     }
 
     public ShardsIterator allShards(String[] indices) {
-        return allShardsSatisfyingPredicate(indices, Predicates.<ShardRouting>alwaysTrue(), false);
+        return allShardsSatisfyingPredicate(indices, shardRouting -> true, false);
     }
 
     public ShardsIterator allShardsIncludingRelocationTargets(String[] indices) {
-        return allShardsSatisfyingPredicate(indices, Predicates.<ShardRouting>alwaysTrue(), true);
+        return allShardsSatisfyingPredicate(indices, shardRouting -> true, true);
     }
 
     // TODO: replace with JDK 8 native java.util.function.Predicate
@@ -244,7 +232,7 @@ public class RoutingTable implements Iterable<IndexRoutingTable>, Diffable<Routi
             }
             for (IndexShardRoutingTable indexShardRoutingTable : indexRoutingTable) {
                 for (ShardRouting shardRouting : indexShardRoutingTable) {
-                    if (predicate.apply(shardRouting)) {
+                    if (predicate.test(shardRouting)) {
                         shards.add(shardRouting);
                         if (includeRelocationTargets && shardRouting.relocating()) {
                             shards.add(shardRouting.buildTargetRelocatingShard());

core/src/main/java/org/elasticsearch/cluster/routing/allocation/allocator/BalancedShardsAllocator.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.cluster.routing.allocation.allocator;
 
-import com.google.common.base.Predicate;
 import org.apache.lucene.util.ArrayUtil;
 import org.apache.lucene.util.IntroSorter;
 import org.elasticsearch.cluster.metadata.MetaData;
@@ -40,6 +39,7 @@ import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.node.settings.NodeSettingsService;
 
 import java.util.*;
+import java.util.function.Predicate;
 
 import static org.elasticsearch.cluster.routing.ShardRoutingState.RELOCATING;
 
@@ -226,13 +226,7 @@ public class BalancedShardsAllocator extends AbstractComponent implements Shards
         private final float threshold;
         private final MetaData metaData;
 
-        private final Predicate<ShardRouting> assignedFilter = new Predicate<ShardRouting>() {
+        private final Predicate<ShardRouting> assignedFilter = shard -> shard.assignedToNode();
-            @Override
-            public boolean apply(ShardRouting input) {
-                return input.assignedToNode();
-            }
-        };
-
 
         public Balancer(ESLogger logger, RoutingAllocation allocation, WeightFunction weight, float threshold) {
             this.logger = logger;

core/src/main/java/org/elasticsearch/common/settings/Settings.java

@@ -20,10 +20,8 @@
 package org.elasticsearch.common.settings;
 
 import com.google.common.base.Charsets;
-import com.google.common.base.Predicate;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSortedMap;
-import com.google.common.collect.Iterables;
 import com.google.common.collect.Maps;
 import org.elasticsearch.Version;
 import org.elasticsearch.common.Booleans;
@@ -1014,7 +1012,7 @@ public final class Settings implements ToXContent {
                 final Matcher matcher = ARRAY_PATTERN.matcher(entry.getKey());
                 if (matcher.matches()) {
                     prefixesToRemove.add(matcher.group(1));
-                } else if (Iterables.any(map.keySet(), startsWith(entry.getKey() + "."))) {
+                } else if (map.keySet().stream().anyMatch(key -> key.startsWith(entry.getKey() + "."))) {
                     prefixesToRemove.add(entry.getKey());
                 }
             }
@@ -1223,22 +1221,4 @@ public final class Settings implements ToXContent {
             return new Settings(Collections.unmodifiableMap(map));
         }
     }
-
-    private static StartsWithPredicate startsWith(String prefix) {
-        return new StartsWithPredicate(prefix);
-    }
-
-    private static final class StartsWithPredicate implements Predicate<String> {
-
-        private String prefix;
-
-        public StartsWithPredicate(String prefix) {
-            this.prefix = prefix;
-        }
-
-        @Override
-        public boolean apply(String input) {
-            return input.startsWith(prefix);
-        }
-    }
 }

core/src/main/java/org/elasticsearch/gateway/MetaDataStateFormat.java

@@ -19,7 +19,6 @@
 package org.elasticsearch.gateway;
 
 import com.google.common.base.Preconditions;
-import com.google.common.base.Predicate;
 import com.google.common.collect.Collections2;
 
 import org.apache.lucene.codecs.CodecUtil;
@@ -48,9 +47,12 @@ import java.io.IOException;
 import java.io.OutputStream;
 import java.nio.file.*;
 import java.util.ArrayList;
+import java.util.Collection;
 import java.util.List;
+import java.util.function.Predicate;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
+import java.util.stream.Collectors;
 
 /**
  * MetaDataStateFormat is a base class to write checksummed
@@ -279,7 +281,12 @@ public abstract class MetaDataStateFormat<T> {
         //       new format (ie. legacy == false) then we know that the latest version state ought to use this new format.
         //       In case the state file with the latest version does not use the new format while older state files do,
         //       the list below will be empty and loading the state will fail
-        for (PathAndStateId pathAndStateId : Collections2.filter(files, new StateIdAndLegacyPredicate(maxStateId, maxStateIdIsLegacy))) {
+        Collection<PathAndStateId> pathAndStateIds = files
+                .stream()
+                .filter(new StateIdAndLegacyPredicate(maxStateId, maxStateIdIsLegacy))
+                .collect(Collectors.toCollection(ArrayList::new));
+
+        for (PathAndStateId pathAndStateId : pathAndStateIds) {
             try {
                 final Path stateFile = pathAndStateId.file;
                 final long id = pathAndStateId.id;
@@ -328,7 +335,7 @@ public abstract class MetaDataStateFormat<T> {
         }
 
         @Override
-        public boolean apply(PathAndStateId input) {
+        public boolean test(PathAndStateId input) {
             return input.id == id && input.legacy == legacy;
         }
     }

core/src/main/java/org/elasticsearch/index/codec/postingsformat/Elasticsearch090PostingsFormat.java

@@ -18,8 +18,6 @@
  */
 package org.elasticsearch.index.codec.postingsformat;
 
-import com.google.common.base.Predicate;
-import com.google.common.base.Predicates;
 import com.google.common.collect.Iterators;
 import org.apache.lucene.codecs.FieldsConsumer;
 import org.apache.lucene.codecs.FieldsProducer;
@@ -36,6 +34,7 @@ import org.elasticsearch.index.mapper.internal.UidFieldMapper;
 
 import java.io.IOException;
 import java.util.Iterator;
+import java.util.function.Predicate;
 
 /**
  * This is the old default postings format for Elasticsearch that special cases
@@ -60,13 +59,8 @@ public class Elasticsearch090PostingsFormat extends PostingsFormat {
     public PostingsFormat getDefaultWrapped() {
         return bloomPostings.getDelegate();
     }
-    protected static final Predicate<String> UID_FIELD_FILTER = new Predicate<String>() {
 
-        @Override
+    protected static final Predicate<String> UID_FIELD_FILTER = field -> UidFieldMapper.NAME.equals(field);
-        public boolean apply(String s) {
-            return  UidFieldMapper.NAME.equals(s);
-        }
-    };
 
     @Override
     public FieldsConsumer fieldsConsumer(SegmentWriteState state) throws IOException {

core/src/main/java/org/elasticsearch/index/mapper/MapperService.java

@@ -21,7 +21,6 @@ package org.elasticsearch.index.mapper;
 
 import com.carrotsearch.hppc.ObjectHashSet;
 import com.google.common.base.Function;
-import com.google.common.base.Predicate;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Iterators;
@@ -71,6 +70,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
+import java.util.function.Predicate;
 
 import static org.elasticsearch.common.collect.MapBuilder.newMapBuilder;
 
@@ -202,20 +202,13 @@ public class MapperService extends AbstractIndexComponent implements Closeable {
                 if (includingDefaultMapping) {
                     iterator = mappers.values().iterator();
                 } else {
-                    iterator = Iterators.filter(mappers.values().iterator(), NOT_A_DEFAULT_DOC_MAPPER);
+                    iterator = mappers.values().stream().filter(mapper -> !DEFAULT_MAPPING.equals(mapper.type())).iterator();
                 }
                 return Iterators.unmodifiableIterator(iterator);
             }
         };
     }
 
-    private static final Predicate<DocumentMapper> NOT_A_DEFAULT_DOC_MAPPER = new Predicate<DocumentMapper>() {
-        @Override
-        public boolean apply(DocumentMapper input) {
-            return !DEFAULT_MAPPING.equals(input.type());
-        }
-    };
-
     public AnalysisService analysisService() {
         return this.analysisService;
     }

core/src/main/java/org/elasticsearch/indices/cluster/IndicesClusterStateService.java

@@ -21,7 +21,6 @@ package org.elasticsearch.indices.cluster;
 
 import com.carrotsearch.hppc.IntHashSet;
 import com.carrotsearch.hppc.cursors.ObjectCursor;
-import com.google.common.base.Predicate;
 import org.elasticsearch.cluster.ClusterChangedEvent;
 import org.elasticsearch.cluster.ClusterService;
 import org.elasticsearch.cluster.ClusterState;
@@ -524,13 +523,7 @@ public class IndicesClusterStateService extends AbstractLifecycleComponent<Indic
                 } else if (isPeerRecovery(shardRouting)) {
                     final DiscoveryNode sourceNode = findSourceNodeForPeerRecovery(routingTable, nodes, shardRouting);
                     // check if there is an existing recovery going, and if so, and the source node is not the same, cancel the recovery to restart it
-                    final Predicate<RecoveryStatus> shouldCancel = new Predicate<RecoveryStatus>() {
+                    if (recoveryTarget.cancelRecoveriesForShard(indexShard.shardId(), "recovery source node changed", status -> !status.sourceNode().equals(sourceNode))) {
-                        @Override
-                        public boolean apply(@Nullable RecoveryStatus status) {
-                            return status.sourceNode().equals(sourceNode) == false;
-                        }
-                    };
-                    if (recoveryTarget.cancelRecoveriesForShard(indexShard.shardId(), "recovery source node changed", shouldCancel)) {
                         logger.debug("[{}][{}] removing shard (recovery source changed), current [{}], global [{}])", shardRouting.index(), shardRouting.id(), currentRoutingEntry, shardRouting);
                         // closing the shard will also cancel any ongoing recovery.
                         indexService.removeShard(shardRouting.id(), "removing shard (recovery source node changed)");

core/src/main/java/org/elasticsearch/indices/recovery/RecoveriesCollection.java

@@ -19,8 +19,6 @@
 
 package org.elasticsearch.indices.recovery;
 
-import com.google.common.base.Predicate;
-import com.google.common.base.Predicates;
 import org.elasticsearch.ElasticsearchTimeoutException;
 import org.elasticsearch.cluster.node.DiscoveryNode;
 import org.elasticsearch.common.logging.ESLogger;
@@ -34,6 +32,7 @@ import org.elasticsearch.threadpool.ThreadPool;
 
 import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.function.Predicate;
 
 /**
  * This class holds a collection of all on going recoveries on the current node (i.e., the node is the target node
@@ -139,7 +138,7 @@ public class RecoveriesCollection {
 
     /** cancel all ongoing recoveries for the given shard. typically because the shards is closed */
     public boolean cancelRecoveriesForShard(ShardId shardId, String reason) {
-        return cancelRecoveriesForShard(shardId, reason, Predicates.<RecoveryStatus>alwaysTrue());
+        return cancelRecoveriesForShard(shardId, reason, status -> true);
     }
 
     /**
@@ -160,7 +159,7 @@ public class RecoveriesCollection {
                 // if we can't increment the status, the recovery is not there any more.
                 if (status.tryIncRef()) {
                     try {
-                        cancel = shouldCancel.apply(status);
+                        cancel = shouldCancel.test(status);
                     } finally {
                         status.decRef();
                     }

core/src/main/java/org/elasticsearch/indices/recovery/RecoveryTarget.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.indices.recovery;
 
-import com.google.common.base.Predicate;
 import org.apache.lucene.index.CorruptIndexException;
 import org.apache.lucene.index.IndexFormatTooNewException;
 import org.apache.lucene.index.IndexFormatTooOldException;
@@ -58,6 +57,7 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.concurrent.atomic.AtomicLong;
 import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.Predicate;
 
 import static org.elasticsearch.common.unit.TimeValue.timeValueMillis;
 

core/src/main/java/org/elasticsearch/search/aggregations/LeafBucketCollector.java

@@ -19,13 +19,13 @@
 
 package org.elasticsearch.search.aggregations;
 
-import com.google.common.base.Predicate;
 import com.google.common.collect.Iterables;
 
 import org.apache.lucene.search.LeafCollector;
 import org.apache.lucene.search.Scorer;
 
 import java.io.IOException;
+import java.util.stream.StreamSupport;
 
 /**
  * Per-leaf bucket collector.
@@ -44,13 +44,8 @@ public abstract class LeafBucketCollector implements LeafCollector {
     };
 
     public static LeafBucketCollector wrap(Iterable<LeafBucketCollector> collectors) {
-        final Iterable<LeafBucketCollector> actualCollectors = Iterables.filter(collectors,
+        final Iterable<LeafBucketCollector> actualCollectors =
-                new Predicate<LeafBucketCollector> () {
+                StreamSupport.stream(collectors.spliterator(), false).filter(c -> c != NO_OP_COLLECTOR)::iterator;
-                    @Override
-                    public boolean apply(LeafBucketCollector c) {
-                        return c != NO_OP_COLLECTOR;
-                    }
-        });
         final LeafBucketCollector[] colls = Iterables.toArray(actualCollectors, LeafBucketCollector.class);
         switch (colls.length) {
         case 0:

core/src/test/java/org/elasticsearch/action/admin/indices/shards/IndicesShardStoreRequestIT.java

@@ -22,7 +22,6 @@ package org.elasticsearch.action.admin.indices.shards;
 import com.carrotsearch.hppc.cursors.IntObjectCursor;
 
 import com.carrotsearch.hppc.cursors.ObjectCursor;
-import com.google.common.base.Predicate;
 import org.apache.lucene.index.CorruptIndexException;
 import org.elasticsearch.action.index.IndexRequestBuilder;
 import org.elasticsearch.client.Requests;
@@ -42,6 +41,7 @@ import org.junit.Test;
 
 import java.util.*;
 import java.util.concurrent.ExecutionException;
+import java.util.function.Predicate;
 
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoTimeout;
@@ -209,7 +209,7 @@ public class IndicesShardStoreRequestIT extends ESIntegTestCase {
         }
 
         @Override
-        public boolean apply(Settings settings) {
+        public boolean test(Settings settings) {
             return nodesWithShard.contains(settings.get("name"));
         }
 

core/src/test/java/org/elasticsearch/action/admin/indices/upgrade/UpgradeIT.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.action.admin.indices.upgrade;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.ExceptionsHelper;
 import org.elasticsearch.Version;
 import org.elasticsearch.action.admin.indices.segments.IndexSegments;
@@ -43,6 +42,7 @@ import org.junit.BeforeClass;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
+import java.util.function.Predicate;
 
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoFailures;
@@ -97,12 +97,7 @@ public class UpgradeIT extends ESBackcompatTestCase {
             if (globalCompatibilityVersion().before(Version.V_1_4_0_Beta1)) {
                 // before 1.4 and the wait_if_ongoing flag, flushes could fail randomly, so we
                 // need to continue to try flushing until all shards succeed
-                assertTrue(awaitBusy(new Predicate<Object>() {
+                assertTrue(awaitBusy(() -> flush(indexName).getFailedShards() == 0));
-                    @Override
-                    public boolean apply(Object o) {
-                        return flush(indexName).getFailedShards() == 0;
-                    }
-                }));
             } else {
                 assertEquals(0, flush(indexName).getFailedShards());
             }
@@ -143,15 +138,12 @@ public class UpgradeIT extends ESBackcompatTestCase {
         
         logger.info("--> Running upgrade on index " + indexToUpgrade);
         assertNoFailures(client().admin().indices().prepareUpgrade(indexToUpgrade).get());
-        awaitBusy(new Predicate<Object>() {
+        awaitBusy(() -> {
-            @Override
-            public boolean apply(Object o) {
             try {
                 return isUpgraded(client(), indexToUpgrade);
             } catch (Exception e) {
                 throw ExceptionsHelper.convertToRuntime(e);
             }
-            }
         });
         logger.info("--> Single index upgrade complete");
 

core/src/test/java/org/elasticsearch/action/support/replication/ShardReplicationTests.java

@@ -18,17 +18,14 @@
  */
 package org.elasticsearch.action.support.replication;
 
-import com.google.common.base.Predicate;
 import org.apache.lucene.index.CorruptIndexException;
 import org.elasticsearch.ElasticsearchException;
-import org.elasticsearch.Version;
 import org.elasticsearch.action.ActionWriteResponse;
 import org.elasticsearch.action.UnavailableShardsException;
 import org.elasticsearch.action.WriteConsistencyLevel;
 import org.elasticsearch.action.support.ActionFilter;
 import org.elasticsearch.action.support.ActionFilters;
 import org.elasticsearch.action.support.PlainActionFuture;
-import org.elasticsearch.cluster.ClusterName;
 import org.elasticsearch.cluster.ClusterService;
 import org.elasticsearch.cluster.ClusterState;
 import org.elasticsearch.cluster.ClusterStateObserver;
@@ -40,16 +37,15 @@ import org.elasticsearch.cluster.block.ClusterBlocks;
 import org.elasticsearch.cluster.metadata.IndexMetaData;
 import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
 import org.elasticsearch.cluster.metadata.MetaData;
-import org.elasticsearch.cluster.node.DiscoveryNode;
+import org.elasticsearch.cluster.routing.IndexShardRoutingTable;
-import org.elasticsearch.cluster.node.DiscoveryNodes;
+import org.elasticsearch.cluster.routing.ShardIterator;
-import org.elasticsearch.cluster.routing.*;
+import org.elasticsearch.cluster.routing.ShardRouting;
-import org.elasticsearch.common.Nullable;
+import org.elasticsearch.cluster.routing.ShardRoutingState;
 import org.elasticsearch.common.collect.Tuple;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.lease.Releasable;
 import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.common.transport.DummyTransportAddress;
 import org.elasticsearch.index.shard.IndexShardNotStartedException;
 import org.elasticsearch.index.shard.IndexShardState;
 import org.elasticsearch.index.shard.ShardId;
@@ -70,7 +66,6 @@ import org.junit.Test;
 import java.io.IOException;
 import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
@@ -79,8 +74,11 @@ import java.util.concurrent.atomic.AtomicInteger;
 
 import static org.elasticsearch.action.support.replication.ClusterStateCreationUtils.state;
 import static org.elasticsearch.action.support.replication.ClusterStateCreationUtils.stateWithStartedPrimary;
-import static org.elasticsearch.cluster.metadata.IndexMetaData.*;
+import static org.hamcrest.Matchers.arrayWithSize;
-import static org.hamcrest.Matchers.*;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.instanceOf;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.hamcrest.Matchers.nullValue;
 
 public class ShardReplicationTests extends ESTestCase {
 
@@ -441,12 +439,7 @@ public class ShardReplicationTests extends ESTestCase {
         t.start();
         // shard operation should be ongoing, so the counter is at 2
         // we have to wait here because increment happens in thread
-        awaitBusy(new Predicate<Object>() {
+        awaitBusy(() -> count.get() == 2);
-            @Override
-            public boolean apply(@Nullable Object input) {
-                    return (count.get() == 2);
-            }
-        });
 
         assertIndexShardCounter(2);
         assertThat(transport.capturedRequests().length, equalTo(0));
@@ -505,12 +498,7 @@ public class ShardReplicationTests extends ESTestCase {
         t.start();
         // shard operation should be ongoing, so the counter is at 2
         // we have to wait here because increment happens in thread
-        awaitBusy(new Predicate<Object>() {
+        awaitBusy(() -> count.get() == 2);
-            @Override
-            public boolean apply(@Nullable Object input) {
-                return count.get() == 2;
-            }
-        });
         ((ActionWithDelay) action).countDownLatch.countDown();
         t.join();
         // operation should have finished and counter decreased because no outstanding replica requests

core/src/test/java/org/elasticsearch/bwcompat/OldIndexBackwardsCompatibilityIT.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.bwcompat;
 
-import com.google.common.base.Predicate;
 import com.google.common.util.concurrent.ListenableFuture;
 
 import org.apache.lucene.index.IndexWriter;
@@ -292,13 +291,12 @@ public class OldIndexBackwardsCompatibilityIT extends ESIntegTestCase {
      * Waits for the index to show up in the cluster state in closed state
      */
     void ensureClosed(final String index) throws InterruptedException {
-        assertTrue(awaitBusy(new Predicate<Object>() {
+        assertTrue(awaitBusy(() -> {
-            @Override
-            public boolean apply(Object o) {
                             ClusterState state = client().admin().cluster().prepareState().get().getState();
                             return state.metaData().hasIndex(index) && state.metaData().index(index).getState() == IndexMetaData.State.CLOSE;
                         }
-        }));
+                )
+        );
     }
 
     /**

core/src/test/java/org/elasticsearch/cache/recycler/MockPageCacheRecycler.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.cache.recycler;
 
-import com.google.common.base.Predicate;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import org.elasticsearch.common.inject.Inject;
@@ -45,12 +44,8 @@ public class MockPageCacheRecycler extends PageCacheRecycler {
             // not empty, we might be executing on a shared cluster that keeps on obtaining
             // and releasing pages, lets make sure that after a reasonable timeout, all master
             // copy (snapshot) have been released
-            boolean success = ESTestCase.awaitBusy(new Predicate<Object>() {
+            boolean success =
-                @Override
+                    ESTestCase.awaitBusy(() -> Sets.intersection(masterCopy.keySet(), ACQUIRED_PAGES.keySet()).isEmpty());
-                public boolean apply(Object input) {
-                    return Sets.intersection(masterCopy.keySet(), ACQUIRED_PAGES.keySet()).isEmpty();
-                }
-            });
             if (!success) {
                 masterCopy.keySet().retainAll(ACQUIRED_PAGES.keySet());
                 ACQUIRED_PAGES.keySet().removeAll(masterCopy.keySet()); // remove all existing master copy we will report on

core/src/test/java/org/elasticsearch/client/transport/TransportClientRetryIT.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.client.transport;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.action.admin.cluster.state.ClusterStateRequest;
 import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
 import org.elasticsearch.action.support.PlainListenableActionFuture;
@@ -30,7 +29,6 @@ import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.transport.TransportAddress;
 import org.elasticsearch.node.internal.InternalSettingsPreparer;
 import org.elasticsearch.test.ESIntegTestCase;
-import org.elasticsearch.test.InternalTestCluster;
 import org.elasticsearch.test.junit.annotations.TestLogging;
 import org.elasticsearch.transport.TransportService;
 import org.junit.Test;
@@ -72,12 +70,7 @@ public class TransportClientRetryIT extends ESIntegTestCase {
             int size = cluster().size();
             //kill all nodes one by one, leaving a single master/data node at the end of the loop
             for (int j = 1; j < size; j++) {
-                internalCluster().stopRandomNode(new Predicate<Settings>() {
+                internalCluster().stopRandomNode(input -> true);
-                    @Override
-                    public boolean apply(Settings input) {
-                        return true;
-                    }
-                });
 
                 ClusterStateRequest clusterStateRequest = Requests.clusterStateRequest().local(true);
                 ClusterState clusterState;

core/src/test/java/org/elasticsearch/cluster/ClusterModuleTests.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.cluster;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.action.admin.indices.create.CreateIndexClusterStateUpdateRequest;
 import org.elasticsearch.cluster.metadata.IndexTemplateFilter;
 import org.elasticsearch.cluster.metadata.IndexTemplateMetaData;
@@ -85,12 +84,7 @@ public class ClusterModuleTests extends ModuleTestCase {
     public void testRegisterClusterDynamicSetting() {
         ClusterModule module = new ClusterModule(Settings.EMPTY);
         module.registerClusterDynamicSetting("foo.bar", Validator.EMPTY);
-        assertInstanceBindingWithAnnotation(module, DynamicSettings.class, new Predicate<DynamicSettings>() {
+        assertInstanceBindingWithAnnotation(module, DynamicSettings.class, dynamicSettings -> dynamicSettings.hasDynamicSetting("foo.bar"), ClusterDynamicSettings.class);
-            @Override
-            public boolean apply(DynamicSettings dynamicSettings) {
-                return dynamicSettings.hasDynamicSetting("foo.bar");
-            }
-        }, ClusterDynamicSettings.class);
     }
 
     public void testRegisterIndexDynamicSettingDuplicate() {
@@ -105,12 +99,7 @@ public class ClusterModuleTests extends ModuleTestCase {
     public void testRegisterIndexDynamicSetting() {
         ClusterModule module = new ClusterModule(Settings.EMPTY);
         module.registerIndexDynamicSetting("foo.bar", Validator.EMPTY);
-        assertInstanceBindingWithAnnotation(module, DynamicSettings.class, new Predicate<DynamicSettings>() {
+        assertInstanceBindingWithAnnotation(module, DynamicSettings.class, dynamicSettings -> dynamicSettings.hasDynamicSetting("foo.bar"), IndexDynamicSettings.class);
-            @Override
-            public boolean apply(DynamicSettings dynamicSettings) {
-                return dynamicSettings.hasDynamicSetting("foo.bar");
-            }
-        }, IndexDynamicSettings.class);
     }
 
     public void testRegisterAllocationDeciderDuplicate() {

core/src/test/java/org/elasticsearch/cluster/ClusterServiceIT.java

@@ -18,7 +18,6 @@
  */
 package org.elasticsearch.cluster;
 
-import com.google.common.base.Predicate;
 import com.google.common.util.concurrent.ListenableFuture;
 import org.apache.log4j.Level;
 import org.apache.log4j.Logger;
@@ -570,12 +569,7 @@ public class ClusterServiceIT extends ESIntegTestCase {
         invoked2.await();
 
         // whenever we test for no tasks, we need to awaitBusy since this is a live node
-        assertTrue(awaitBusy(new Predicate<Object>() {
+        assertTrue(awaitBusy(() -> clusterService.pendingTasks().isEmpty()));
-            @Override
-            public boolean apply(Object input) {
-                return clusterService.pendingTasks().isEmpty();
-            }
-        }));
         waitNoPendingTasksOnAll();
 
         final CountDownLatch block2 = new CountDownLatch(1);
@@ -688,12 +682,7 @@ public class ClusterServiceIT extends ESIntegTestCase {
         internalCluster().stopRandomNonMasterNode();
 
         // there should not be any master as the minimum number of required eligible masters is not met
-        awaitBusy(new Predicate<Object>() {
+        awaitBusy(() -> clusterService1.state().nodes().masterNode() == null && clusterService1.state().status() == ClusterState.ClusterStateStatus.APPLIED);
-            @Override
-            public boolean apply(Object obj) {
-                return clusterService1.state().nodes().masterNode() == null && clusterService1.state().status() == ClusterState.ClusterStateStatus.APPLIED;
-            }
-        });
         assertThat(testService1.master(), is(false));
 
         // bring the node back up

core/src/test/java/org/elasticsearch/cluster/MinimumMasterNodesIT.java

@@ -19,8 +19,6 @@
 
 package org.elasticsearch.cluster;
 
-import com.google.common.base.Predicate;
-
 import org.elasticsearch.action.admin.cluster.health.ClusterHealthResponse;
 import org.elasticsearch.client.Client;
 import org.elasticsearch.common.Priority;
@@ -36,12 +34,16 @@ import org.junit.Test;
 
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
+import java.util.function.Predicate;
 
 import static org.elasticsearch.common.settings.Settings.settingsBuilder;
 import static org.elasticsearch.test.ESIntegTestCase.Scope;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertHitCount;
-import static org.hamcrest.Matchers.*;
+import static org.hamcrest.Matchers.empty;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.isOneOf;
+import static org.hamcrest.Matchers.not;
 
 @ClusterScope(scope = Scope.TEST, numDataNodes = 0)
 @ESIntegTestCase.SuppressLocalMode
@@ -98,12 +100,9 @@ public class MinimumMasterNodesIT extends ESIntegTestCase {
         }
 
         internalCluster().stopCurrentMasterNode();
-        awaitBusy(new Predicate<Object>() {
+        awaitBusy(() -> {
-            @Override
+            ClusterState clusterState = client().admin().cluster().prepareState().setLocal(true).execute().actionGet().getState();
-            public boolean apply(Object obj) {
+            return clusterState.blocks().hasGlobalBlock(DiscoverySettings.NO_MASTER_BLOCK_ID);
-                ClusterState state = client().admin().cluster().prepareState().setLocal(true).execute().actionGet().getState();
-                return state.blocks().hasGlobalBlock(DiscoverySettings.NO_MASTER_BLOCK_ID);
-            }
         });
         state = client().admin().cluster().prepareState().setLocal(true).execute().actionGet().getState();
         assertThat(state.blocks().hasGlobalBlock(DiscoverySettings.NO_MASTER_BLOCK_ID), equalTo(true));
@@ -278,20 +277,26 @@ public class MinimumMasterNodesIT extends ESIntegTestCase {
     }
 
     private void assertNoMasterBlockOnAllNodes() throws InterruptedException {
-        assertThat(awaitBusy(new Predicate<Object>() {
+        Predicate<Client> hasNoMasterBlock = client -> {
-            @Override
+            ClusterState state = client.admin().cluster().prepareState().setLocal(true).execute().actionGet().getState();
-            public boolean apply(Object obj) {
+            return state.blocks().hasGlobalBlock(DiscoverySettings.NO_MASTER_BLOCK_ID);
+        };
+        assertTrue(awaitBusy(
+                        () -> {
                             boolean success = true;
                             for (Client client : internalCluster()) {
-                    ClusterState state = client.admin().cluster().prepareState().setLocal(true).execute().actionGet().getState();
+                                boolean clientHasNoMasterBlock = hasNoMasterBlock.test(client);
-                    success &= state.blocks().hasGlobalBlock(DiscoverySettings.NO_MASTER_BLOCK_ID);
                                 if (logger.isDebugEnabled()) {
-                        logger.debug("Checking for NO_MASTER_BLOCK on client: {} NO_MASTER_BLOCK: [{}]", client, state.blocks().hasGlobalBlock(DiscoverySettings.NO_MASTER_BLOCK_ID));
+                                    logger.debug("Checking for NO_MASTER_BLOCK on client: {} NO_MASTER_BLOCK: [{}]", client, clientHasNoMasterBlock);
                                 }
+                                success &= clientHasNoMasterBlock;
                             }
                             return success;
-            }
+                        },
-        }, 20, TimeUnit.SECONDS), equalTo(true));
+                        20,
+                        TimeUnit.SECONDS
+                )
+        );
     }
 
     @Test

core/src/test/java/org/elasticsearch/cluster/NoMasterNodeIT.java

@@ -19,8 +19,6 @@
 
 package org.elasticsearch.cluster;
 
-import com.google.common.base.Predicate;
-
 import org.elasticsearch.action.ActionRequestBuilder;
 import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
 import org.elasticsearch.action.bulk.BulkRequestBuilder;
@@ -244,14 +242,11 @@ public class NoMasterNodeIT extends ESIntegTestCase {
         logger.info("Cluster state:\n" + clusterState.getState().prettyPrint());
 
         internalCluster().stopRandomDataNode();
-        assertThat(awaitBusy(new Predicate<Object>() {
+        assertTrue(awaitBusy(() -> {
-            @Override
-            public boolean apply(Object o) {
                     ClusterState state = client().admin().cluster().prepareState().setLocal(true).get().getState();
                     return state.blocks().hasGlobalBlock(DiscoverySettings.NO_MASTER_BLOCK_ID);
                 }
-        }), equalTo(true));
+        ));
-
 
         GetResponse getResponse = client().prepareGet("test1", "type1", "1").get();
         assertExists(getResponse);

core/src/test/java/org/elasticsearch/cluster/ack/AckIT.java

@@ -19,6 +19,7 @@
 
 package org.elasticsearch.cluster.ack;
 
+import com.carrotsearch.hppc.cursors.ObjectObjectCursor;
 import org.elasticsearch.action.admin.cluster.reroute.ClusterRerouteResponse;
 import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
 import org.elasticsearch.action.admin.indices.alias.IndicesAliasesResponse;
@@ -34,8 +35,8 @@ import org.elasticsearch.cluster.ClusterState;
 import org.elasticsearch.cluster.metadata.AliasMetaData;
 import org.elasticsearch.cluster.metadata.AliasOrIndex;
 import org.elasticsearch.cluster.metadata.IndexMetaData;
-import org.elasticsearch.cluster.routing.ShardRouting;
 import org.elasticsearch.cluster.routing.RoutingNode;
+import org.elasticsearch.cluster.routing.ShardRouting;
 import org.elasticsearch.cluster.routing.ShardRoutingState;
 import org.elasticsearch.cluster.routing.allocation.command.MoveAllocationCommand;
 import org.elasticsearch.common.settings.Settings;
@@ -44,17 +45,19 @@ import org.elasticsearch.index.query.QueryBuilders;
 import org.elasticsearch.search.warmer.IndexWarmersMetaData;
 import org.elasticsearch.test.ESIntegTestCase;
 import org.junit.Test;
-import com.carrotsearch.hppc.cursors.ObjectObjectCursor;
-import com.google.common.base.Predicate;
 
 import java.util.List;
 import java.util.concurrent.TimeUnit;
 
-import static org.elasticsearch.cluster.metadata.IndexMetaData.*;
+import static org.elasticsearch.cluster.metadata.IndexMetaData.SETTING_NUMBER_OF_REPLICAS;
+import static org.elasticsearch.cluster.metadata.IndexMetaData.SETTING_NUMBER_OF_SHARDS;
+import static org.elasticsearch.cluster.metadata.IndexMetaData.State;
 import static org.elasticsearch.common.settings.Settings.settingsBuilder;
 import static org.elasticsearch.test.ESIntegTestCase.ClusterScope;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
-import static org.hamcrest.Matchers.*;
+import static org.hamcrest.Matchers.anyOf;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.notNullValue;
 
 @ClusterScope(minNumDataNodes = 2)
 public class AckIT extends ESIntegTestCase {
@@ -120,9 +123,7 @@ public class AckIT extends ESIntegTestCase {
         /* Since we don't wait for the ack here we have to wait until the search request has been executed from the master
          * otherwise the test infra might have already deleted the index and the search request fails on all shards causing
          * the test to fail too. We simply wait until the the warmer has been installed and also clean it up afterwards.*/
-        assertTrue(awaitBusy(new Predicate<Object>() {
+        assertTrue(awaitBusy(() -> {
-            @Override
-            public boolean apply(Object input) {
             for (Client client : clients()) {
                 GetWarmersResponse getWarmersResponse = client.admin().indices().prepareGetWarmers().setLocal(true).get();
                 if (getWarmersResponse.warmers().size() != 1) {
@@ -130,7 +131,6 @@ public class AckIT extends ESIntegTestCase {
                 }
             }
             return true;
-            }
         }));
         assertAcked(client().admin().indices().prepareDeleteWarmer().setIndices("test").setNames("custom_warmer"));
     }
@@ -161,9 +161,7 @@ public class AckIT extends ESIntegTestCase {
 
         DeleteWarmerResponse deleteWarmerResponse = client().admin().indices().prepareDeleteWarmer().setIndices("test").setNames("custom_warmer").setTimeout("0s").get();
         assertFalse(deleteWarmerResponse.isAcknowledged());
-        assertTrue(awaitBusy(new Predicate<Object>() { // wait until they are all deleted
+        assertTrue(awaitBusy(() -> {
-            @Override
-            public boolean apply(Object input) {
             for (Client client : clients()) {
                 GetWarmersResponse getWarmersResponse = client.admin().indices().prepareGetWarmers().setLocal(true).get();
                 if (getWarmersResponse.warmers().size() > 0) {
@@ -171,7 +169,6 @@ public class AckIT extends ESIntegTestCase {
                 }
             }
             return true;
-            }
         }));
     }
 

core/src/test/java/org/elasticsearch/cluster/allocation/AwarenessAllocationIT.java

@@ -20,7 +20,6 @@
 package org.elasticsearch.cluster.allocation;
 
 import com.carrotsearch.hppc.ObjectIntHashMap;
-import com.google.common.base.Predicate;
 import org.elasticsearch.action.admin.cluster.health.ClusterHealthResponse;
 import org.elasticsearch.cluster.ClusterState;
 import org.elasticsearch.cluster.routing.IndexRoutingTable;
@@ -78,10 +77,8 @@ public class AwarenessAllocationIT extends ESIntegTestCase {
         final String node3 = internalCluster().startNode(Settings.settingsBuilder().put(commonSettings).put("node.rack_id", "rack_2").build());
 
         // On slow machines the initial relocation might be delayed
-        assertThat(awaitBusy(new Predicate<Object>() {
+        assertThat(awaitBusy(
-            @Override
+                () -> {
-            public boolean apply(Object input) {
-
                     logger.info("--> waiting for no relocation");
                     ClusterHealthResponse clusterHealth = client().admin().cluster().prepareHealth().setWaitForEvents(Priority.LANGUID).setWaitForGreenStatus().setWaitForNodes("3").setWaitForRelocatingShards(0).get();
                     if (clusterHealth.isTimedOut()) {
@@ -100,8 +97,10 @@ public class AwarenessAllocationIT extends ESIntegTestCase {
                         }
                     }
                     return counts.get(node3) == totalPrimaries;
-            }
+                },
-        }, 10, TimeUnit.SECONDS), equalTo(true));
+                10,
+                TimeUnit.SECONDS
+        ), equalTo(true));
     }
     
     @Test

core/src/test/java/org/elasticsearch/cluster/routing/allocation/decider/DiskThresholdDeciderTests.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.cluster.routing.allocation.decider;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.Version;
 import org.elasticsearch.cluster.ClusterInfo;
 import org.elasticsearch.cluster.ClusterInfoService;
@@ -29,7 +28,14 @@ import org.elasticsearch.cluster.metadata.IndexMetaData;
 import org.elasticsearch.cluster.metadata.MetaData;
 import org.elasticsearch.cluster.node.DiscoveryNode;
 import org.elasticsearch.cluster.node.DiscoveryNodes;
-import org.elasticsearch.cluster.routing.*;
+import org.elasticsearch.cluster.routing.IndexRoutingTable;
+import org.elasticsearch.cluster.routing.IndexShardRoutingTable;
+import org.elasticsearch.cluster.routing.RoutingNode;
+import org.elasticsearch.cluster.routing.RoutingNodes;
+import org.elasticsearch.cluster.routing.RoutingTable;
+import org.elasticsearch.cluster.routing.ShardRouting;
+import org.elasticsearch.cluster.routing.ShardRoutingState;
+import org.elasticsearch.cluster.routing.TestShardRouting;
 import org.elasticsearch.cluster.routing.allocation.AllocationService;
 import org.elasticsearch.cluster.routing.allocation.RoutingAllocation;
 import org.elasticsearch.cluster.routing.allocation.allocator.ShardsAllocators;
@@ -37,15 +43,24 @@ import org.elasticsearch.cluster.routing.allocation.command.AllocationCommand;
 import org.elasticsearch.cluster.routing.allocation.command.AllocationCommands;
 import org.elasticsearch.cluster.routing.allocation.command.MoveAllocationCommand;
 import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.test.ESAllocationTestCase;
-import org.elasticsearch.test.gateway.NoopGatewayAllocator;
 import org.elasticsearch.common.transport.LocalTransportAddress;
 import org.elasticsearch.index.shard.ShardId;
+import org.elasticsearch.test.ESAllocationTestCase;
+import org.elasticsearch.test.gateway.NoopGatewayAllocator;
 import org.junit.Test;
 
-import java.util.*;
+import java.util.AbstractMap;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
 
-import static org.elasticsearch.cluster.routing.ShardRoutingState.*;
+import static org.elasticsearch.cluster.routing.ShardRoutingState.INITIALIZING;
+import static org.elasticsearch.cluster.routing.ShardRoutingState.RELOCATING;
+import static org.elasticsearch.cluster.routing.ShardRoutingState.STARTED;
+import static org.elasticsearch.cluster.routing.ShardRoutingState.UNASSIGNED;
 import static org.elasticsearch.common.settings.Settings.settingsBuilder;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.is;
@@ -899,12 +914,7 @@ public class DiskThresholdDeciderTests extends ESAllocationTestCase {
     public void logShardStates(ClusterState state) {
         RoutingNodes rn = state.getRoutingNodes();
         logger.info("--> counts: total: {}, unassigned: {}, initializing: {}, relocating: {}, started: {}",
-                rn.shards(new Predicate<ShardRouting>() {
+                rn.shards(shard -> true).size(),
-                    @Override
-                    public boolean apply(ShardRouting input) {
-                        return true;
-                    }
-                }).size(),
                 rn.shardsWithState(UNASSIGNED).size(),
                 rn.shardsWithState(INITIALIZING).size(),
                 rn.shardsWithState(RELOCATING).size(),

core/src/test/java/org/elasticsearch/common/inject/ModuleTestCase.java

@@ -18,7 +18,6 @@
  */
 package org.elasticsearch.common.inject;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.common.inject.spi.Element;
 import org.elasticsearch.common.inject.spi.Elements;
 import org.elasticsearch.common.inject.spi.InstanceBinding;
@@ -34,6 +33,7 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.function.Predicate;
 
 /**
  * Base testcase for testing {@link Module} implementations.
@@ -160,7 +160,7 @@ public abstract class ModuleTestCase extends ESTestCase {
                 InstanceBinding binding = (InstanceBinding) element;
                 if (to.equals(binding.getKey().getTypeLiteral().getType())) {
                     if (annotation == null || annotation.equals(binding.getKey().getAnnotationType())) {
-                        assertTrue(tester.apply(to.cast(binding.getInstance())));
+                        assertTrue(tester.test(to.cast(binding.getInstance())));
                         return;
                     }
                 }

core/src/test/java/org/elasticsearch/common/util/MockBigArrays.java

@@ -21,7 +21,6 @@ package org.elasticsearch.common.util;
 
 import com.carrotsearch.randomizedtesting.RandomizedContext;
 import com.carrotsearch.randomizedtesting.SeedUtils;
-import com.google.common.base.Predicate;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import org.apache.lucene.util.Accountable;
@@ -59,12 +58,7 @@ public class MockBigArrays extends BigArrays {
             // not empty, we might be executing on a shared cluster that keeps on obtaining
             // and releasing arrays, lets make sure that after a reasonable timeout, all master
             // copy (snapshot) have been released
-            boolean success = ESTestCase.awaitBusy(new Predicate<Object>() {
+            boolean success = ESTestCase.awaitBusy(() -> Sets.intersection(masterCopy.keySet(), ACQUIRED_ARRAYS.keySet()).isEmpty());
-                @Override
-                public boolean apply(Object input) {
-                    return Sets.intersection(masterCopy.keySet(), ACQUIRED_ARRAYS.keySet()).isEmpty();
-                }
-            });
             if (!success) {
                 masterCopy.keySet().retainAll(ACQUIRED_ARRAYS.keySet());
                 ACQUIRED_ARRAYS.keySet().removeAll(masterCopy.keySet()); // remove all existing master copy we will report on

core/src/test/java/org/elasticsearch/discovery/DiscoveryWithServiceDisruptionsIT.java

@@ -19,9 +19,7 @@
 
 package org.elasticsearch.discovery;
 
-import com.google.common.base.Predicate;
 import org.apache.lucene.util.LuceneTestCase;
-import org.apache.lucene.util.LuceneTestCase.AwaitsFix;
 import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.action.admin.cluster.health.ClusterHealthResponse;
 import org.elasticsearch.action.admin.cluster.reroute.ClusterRerouteResponse;
@@ -32,7 +30,11 @@ import org.elasticsearch.action.get.GetResponse;
 import org.elasticsearch.action.index.IndexRequestBuilder;
 import org.elasticsearch.action.index.IndexResponse;
 import org.elasticsearch.client.Client;
-import org.elasticsearch.cluster.*;
+import org.elasticsearch.cluster.ClusterChangedEvent;
+import org.elasticsearch.cluster.ClusterService;
+import org.elasticsearch.cluster.ClusterState;
+import org.elasticsearch.cluster.ClusterStateListener;
+import org.elasticsearch.cluster.ClusterStateUpdateTask;
 import org.elasticsearch.cluster.action.shard.ShardStateAction;
 import org.elasticsearch.cluster.block.ClusterBlock;
 import org.elasticsearch.cluster.block.ClusterBlockLevel;
@@ -65,7 +67,16 @@ import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.test.ESIntegTestCase;
 import org.elasticsearch.test.InternalTestCluster;
 import org.elasticsearch.test.discovery.ClusterDiscoveryConfiguration;
-import org.elasticsearch.test.disruption.*;
+import org.elasticsearch.test.disruption.BlockClusterStateProcessing;
+import org.elasticsearch.test.disruption.IntermittentLongGCDisruption;
+import org.elasticsearch.test.disruption.LongGCDisruption;
+import org.elasticsearch.test.disruption.NetworkDelaysPartition;
+import org.elasticsearch.test.disruption.NetworkDisconnectPartition;
+import org.elasticsearch.test.disruption.NetworkPartition;
+import org.elasticsearch.test.disruption.NetworkUnresponsivePartition;
+import org.elasticsearch.test.disruption.ServiceDisruptionScheme;
+import org.elasticsearch.test.disruption.SingleNodeDisruption;
+import org.elasticsearch.test.disruption.SlowClusterStateProcessing;
 import org.elasticsearch.test.junit.annotations.TestLogging;
 import org.elasticsearch.test.transport.MockTransportService;
 import org.elasticsearch.transport.TransportException;
@@ -76,8 +87,22 @@ import org.junit.Before;
 import org.junit.Test;
 
 import java.io.IOException;
-import java.util.*;
+import java.util.ArrayList;
-import java.util.concurrent.*;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+import java.util.concurrent.Semaphore;
+import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicReference;
@@ -86,7 +111,10 @@ import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
 import static org.elasticsearch.test.ESIntegTestCase.ClusterScope;
 import static org.elasticsearch.test.ESIntegTestCase.Scope;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
-import static org.hamcrest.Matchers.*;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.not;
+import static org.hamcrest.Matchers.nullValue;
 
 @ClusterScope(scope = Scope.TEST, numDataNodes = 0, transportClientRatio = 0)
 @ESIntegTestCase.SuppressLocalMode
@@ -1354,12 +1382,14 @@ public class DiscoveryWithServiceDisruptionsIT extends ESIntegTestCase {
 
     private void assertDiscoveryCompleted(List<String> nodes) throws InterruptedException {
         for (final String node : nodes) {
-            assertTrue("node [" + node + "] is still joining master", awaitBusy(new Predicate<Object>() {
+            assertTrue(
-                @Override
+                    "node [" + node + "] is still joining master",
-                public boolean apply(Object input) {
+                    awaitBusy(
-                    return !((ZenDiscovery) internalCluster().getInstance(Discovery.class, node)).joiningCluster();
+                            () -> !((ZenDiscovery) internalCluster().getInstance(Discovery.class, node)).joiningCluster(),
-                }
+                            30,
-            }, 30, TimeUnit.SECONDS));
+                            TimeUnit.SECONDS
+                    )
+            );
         }
     }
 }

core/src/test/java/org/elasticsearch/gateway/AsyncShardFetchTests.java

@@ -18,7 +18,6 @@
  */
 package org.elasticsearch.gateway;
 
-import com.google.common.base.Predicate;
 import com.google.common.collect.ImmutableSet;
 import org.elasticsearch.Version;
 import org.elasticsearch.action.FailedNodeException;
@@ -286,12 +285,7 @@ public class AsyncShardFetchTests extends ESTestCase {
                             entry = simulations.get(nodeId);
                             if (entry == null) {
                                 // we are simulating a master node switch, wait for it to not be null
-                                awaitBusy(new Predicate<Object>() {
+                                awaitBusy(() ->  simulations.containsKey(nodeId));
-                                    @Override
-                                    public boolean apply(Object input) {
-                                        return simulations.containsKey(nodeId);
-                                    }
-                                });
                             }
                             assert entry != null;
                             entry.executeLatch.await();

core/src/test/java/org/elasticsearch/gateway/MetaDataWriteDataNodesIT.java

@@ -20,7 +20,6 @@
 package org.elasticsearch.gateway;
 
 import com.carrotsearch.hppc.cursors.ObjectObjectCursor;
-import com.google.common.base.Predicate;
 import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
 import org.elasticsearch.action.admin.indices.mapping.get.GetMappingsResponse;
 import org.elasticsearch.cluster.metadata.IndexMetaData;
@@ -160,9 +159,7 @@ public class MetaDataWriteDataNodesIT extends ESIntegTestCase {
 
 
     private void assertMetaState(final String nodeName, final String indexName, final boolean shouldBe) throws Exception {
-        awaitBusy(new Predicate<Object>() {
+        awaitBusy(() -> {
-            @Override
-            public boolean apply(Object o) {
             logger.info("checking if meta state exists...");
             try {
                 return shouldBe == metaStateExists(nodeName, indexName);
@@ -172,7 +169,6 @@ public class MetaDataWriteDataNodesIT extends ESIntegTestCase {
                 // this here is a hack, would be much better to use for example a WatchService
                 return false;
             }
-            }
         });
         boolean inMetaSate = metaStateExists(nodeName, indexName);
         if (shouldBe) {

core/src/test/java/org/elasticsearch/gateway/QuorumGatewayIT.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.gateway;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.action.admin.cluster.health.ClusterHealthResponse;
 import org.elasticsearch.action.admin.cluster.health.ClusterHealthStatus;
 import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
@@ -36,10 +35,12 @@ import static org.elasticsearch.client.Requests.clusterHealthRequest;
 import static org.elasticsearch.common.settings.Settings.settingsBuilder;
 import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
 import static org.elasticsearch.index.query.QueryBuilders.matchAllQuery;
-import static org.elasticsearch.test.ESIntegTestCase.*;
+import static org.elasticsearch.test.ESIntegTestCase.Scope;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertHitCount;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoFailures;
-import static org.hamcrest.Matchers.*;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
 
 /**
  *
@@ -92,12 +93,10 @@ public class QuorumGatewayIT extends ESIntegTestCase {
         ClusterHealthResponse clusterHealth = client().admin().cluster().health(clusterHealthRequest().waitForNodes("1")).actionGet();
         assertThat(clusterHealth.isTimedOut(), equalTo(false));
         assertThat(clusterHealth.getStatus(), equalTo(ClusterHealthStatus.RED));  // nothing allocated yet
-        assertThat(awaitBusy(new Predicate<Object>() {
+        assertTrue(awaitBusy(() -> {
-            @Override
-            public boolean apply(Object input) {
             ClusterStateResponse clusterStateResponse = internalCluster().smartClient().admin().cluster().prepareState().setMasterNodeTimeout("500ms").get();
             return clusterStateResponse.getState() != null && clusterStateResponse.getState().routingTable().index("test") != null;
-            }}), equalTo(true)); // wait until we get a cluster state - could be null if we quick enough.
+        })); // wait until we get a cluster state - could be null if we quick enough.
         final ClusterStateResponse clusterStateResponse = internalCluster().smartClient().admin().cluster().prepareState().setMasterNodeTimeout("500ms").get();
         assertThat(clusterStateResponse.getState(), notNullValue());
         assertThat(clusterStateResponse.getState().routingTable().index("test"), notNullValue());
@@ -149,15 +148,12 @@ public class QuorumGatewayIT extends ESIntegTestCase {
             @Override
             public void doAfterNodes(int numNodes, final Client activeClient) throws Exception {
                 if (numNodes == 1) {
-                    assertThat(awaitBusy(new Predicate<Object>() {
+                    assertTrue(awaitBusy(() -> {
-                        @Override
-                        public boolean apply(Object input) {
                         logger.info("--> running cluster_health (wait for the shards to startup)");
                         ClusterHealthResponse clusterHealth = activeClient.admin().cluster().health(clusterHealthRequest().waitForYellowStatus().waitForNodes("2").waitForActiveShards(test.numPrimaries * 2)).actionGet();
                         logger.info("--> done cluster_health, status " + clusterHealth.getStatus());
                         return (!clusterHealth.isTimedOut()) && clusterHealth.getStatus() == ClusterHealthStatus.YELLOW;
-                        }
+                    }, 30, TimeUnit.SECONDS));
-                    }, 30, TimeUnit.SECONDS), equalTo(true));
                     logger.info("--> one node is closed -- index 1 document into the remaining nodes");
                     activeClient.prepareIndex("test", "type1", "3").setSource(jsonBuilder().startObject().field("field", "value3").endObject()).get();
                     assertNoFailures(activeClient.admin().indices().prepareRefresh().get());

core/src/test/java/org/elasticsearch/index/TransportIndexFailuresIT.java

@@ -19,14 +19,12 @@
 
 package org.elasticsearch.index;
 
-import com.google.common.base.Predicate;
 import com.google.common.collect.ImmutableSet;
 import org.elasticsearch.action.admin.cluster.health.ClusterHealthStatus;
 import org.elasticsearch.action.index.IndexAction;
 import org.elasticsearch.action.index.IndexResponse;
 import org.elasticsearch.cluster.ClusterState;
 import org.elasticsearch.cluster.routing.IndexShardRoutingTable;
-import org.elasticsearch.cluster.routing.ShardRouting;
 import org.elasticsearch.cluster.routing.RoutingNodes;
 import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.settings.Settings;
@@ -36,14 +34,16 @@ import org.elasticsearch.discovery.zen.fd.FaultDetection;
 import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.test.ESIntegTestCase;
 import org.elasticsearch.test.transport.MockTransportService;
-import org.elasticsearch.transport.TransportModule;
 import org.elasticsearch.transport.TransportService;
 import org.junit.Test;
 
 import java.util.Collection;
 import java.util.List;
 
-import static org.elasticsearch.cluster.routing.ShardRoutingState.*;
+import static org.elasticsearch.cluster.routing.ShardRoutingState.INITIALIZING;
+import static org.elasticsearch.cluster.routing.ShardRoutingState.RELOCATING;
+import static org.elasticsearch.cluster.routing.ShardRoutingState.STARTED;
+import static org.elasticsearch.cluster.routing.ShardRoutingState.UNASSIGNED;
 import static org.hamcrest.Matchers.equalTo;
 
 /**
@@ -142,12 +142,7 @@ public class TransportIndexFailuresIT extends ESIntegTestCase {
         state = getNodeClusterState(randomFrom(nodes.toArray(Strings.EMPTY_ARRAY)));
         RoutingNodes rn = state.getRoutingNodes();
         logger.info("--> counts: total: {}, unassigned: {}, initializing: {}, relocating: {}, started: {}",
-                rn.shards(new Predicate<ShardRouting>() {
+                rn.shards(input -> true).size(),
-                    @Override
-                    public boolean apply(ShardRouting input) {
-                        return true;
-                    }
-                }).size(),
                 rn.shardsWithState(UNASSIGNED).size(),
                 rn.shardsWithState(INITIALIZING).size(),
                 rn.shardsWithState(RELOCATING).size(),

core/src/test/java/org/elasticsearch/index/codec/postingformat/Elasticsearch090RWPostingsFormat.java

@@ -19,22 +19,21 @@
 
 package org.elasticsearch.index.codec.postingformat;
 
-import com.google.common.base.Predicates;
 import com.google.common.collect.Iterators;
-
 import org.apache.lucene.codecs.FieldsConsumer;
 import org.apache.lucene.codecs.PostingsFormat;
 import org.apache.lucene.index.Fields;
 import org.apache.lucene.index.FilterLeafReader;
 import org.apache.lucene.index.SegmentWriteState;
 import org.elasticsearch.common.util.BloomFilter;
-import org.elasticsearch.index.codec.postingsformat.BloomFilterPostingsFormat.BloomFilteredFieldsConsumer;
 import org.elasticsearch.index.codec.postingsformat.BloomFilterPostingsFormat;
+import org.elasticsearch.index.codec.postingsformat.BloomFilterPostingsFormat.BloomFilteredFieldsConsumer;
 import org.elasticsearch.index.codec.postingsformat.Elasticsearch090PostingsFormat;
 import org.elasticsearch.index.mapper.internal.UidFieldMapper;
 
 import java.io.IOException;
 import java.util.Iterator;
+import java.util.stream.StreamSupport;
 
 /** read-write version with blooms for testing */
 public class Elasticsearch090RWPostingsFormat extends Elasticsearch090PostingsFormat {
@@ -55,7 +54,7 @@ public class Elasticsearch090RWPostingsFormat extends Elasticsearch090PostingsFo
                 Fields maskedFields = new FilterLeafReader.FilterFields(fields) {
                     @Override
                     public Iterator<String> iterator() {
-                        return Iterators.filter(this.in.iterator(), Predicates.not(UID_FIELD_FILTER));
+                        return StreamSupport.stream(this.in.spliterator(), false).filter(UID_FIELD_FILTER.negate()).iterator();
                     }
                 };
                 fieldsConsumer.getDelegate().write(maskedFields);

core/src/test/java/org/elasticsearch/index/engine/InternalEngineMergeIT.java

@@ -18,7 +18,6 @@
  */
 package org.elasticsearch.index.engine;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.action.admin.indices.stats.IndicesStatsResponse;
 import org.elasticsearch.action.bulk.BulkRequestBuilder;
 import org.elasticsearch.action.bulk.BulkResponse;
@@ -65,15 +64,12 @@ public class InternalEngineMergeIT extends ESIntegTestCase {
             logger.info("index round [{}] - segments {}, total merges {}, current merge {}", i, stats.getPrimaries().getSegments().getCount(), stats.getPrimaries().getMerge().getTotal(), stats.getPrimaries().getMerge().getCurrent());
         }
         final long upperNumberSegments = 2 * numOfShards * 10;
-        awaitBusy(new Predicate<Object>() {
+        awaitBusy(() -> {
-            @Override
-            public boolean apply(Object input) {
             IndicesStatsResponse stats = client().admin().indices().prepareStats().setSegments(true).setMerge(true).get();
             logger.info("numshards {}, segments {}, total merges {}, current merge {}", numOfShards, stats.getPrimaries().getSegments().getCount(), stats.getPrimaries().getMerge().getTotal(), stats.getPrimaries().getMerge().getCurrent());
             long current = stats.getPrimaries().getMerge().getCurrent();
             long count = stats.getPrimaries().getSegments().getCount();
             return count < upperNumberSegments && current == 0;
-            }
         });
         IndicesStatsResponse stats = client().admin().indices().prepareStats().setSegments(true).setMerge(true).get();
         logger.info("numshards {}, segments {}, total merges {}, current merge {}", numOfShards, stats.getPrimaries().getSegments().getCount(), stats.getPrimaries().getMerge().getTotal(), stats.getPrimaries().getMerge().getCurrent());

core/src/test/java/org/elasticsearch/index/store/CorruptedFileIT.java

@@ -20,7 +20,6 @@ package org.elasticsearch.index.store;
 
 import com.carrotsearch.randomizedtesting.generators.RandomPicks;
 import com.google.common.base.Charsets;
-import com.google.common.base.Predicate;
 import org.apache.lucene.codecs.CodecUtil;
 import org.apache.lucene.index.CheckIndex;
 import org.apache.lucene.index.IndexFileNames;
@@ -107,8 +106,16 @@ import java.util.concurrent.atomic.AtomicBoolean;
 
 import static org.elasticsearch.common.settings.Settings.settingsBuilder;
 import static org.elasticsearch.common.util.CollectionUtils.iterableAsArrayList;
-import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.*;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
-import static org.hamcrest.Matchers.*;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAllSuccessful;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertHitCount;
+import static org.hamcrest.Matchers.anyOf;
+import static org.hamcrest.Matchers.empty;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.greaterThanOrEqualTo;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.not;
+import static org.hamcrest.Matchers.notNullValue;
 
 @ESIntegTestCase.ClusterScope(scope = ESIntegTestCase.Scope.SUITE)
 public class CorruptedFileIT extends ESIntegTestCase {
@@ -279,13 +286,10 @@ public class CorruptedFileIT extends ESIntegTestCase {
         client().admin().indices().prepareUpdateSettings("test").setSettings(build).get();
         client().admin().cluster().prepareReroute().get();
 
-        boolean didClusterTurnRed = awaitBusy(new Predicate<Object>() {
+        boolean didClusterTurnRed = awaitBusy(() -> {
-            @Override
-            public boolean apply(Object input) {
                 ClusterHealthStatus test = client().admin().cluster()
                         .health(Requests.clusterHealthRequest("test")).actionGet().getStatus();
                 return test == ClusterHealthStatus.RED;
-            }
         }, 5, TimeUnit.MINUTES);// sometimes on slow nodes the replication / recovery is just dead slow
         final ClusterHealthResponse response = client().admin().cluster()
                 .health(Requests.clusterHealthRequest("test")).get();

core/src/test/java/org/elasticsearch/indices/IndicesLifecycleListenerIT.java

@@ -18,7 +18,6 @@
  */
 package org.elasticsearch.indices;
 
-import com.google.common.base.Predicate;
 import com.google.common.collect.Maps;
 import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
@@ -45,12 +44,17 @@ import java.util.concurrent.ConcurrentMap;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.BooleanSupplier;
 
 import static org.elasticsearch.cluster.metadata.IndexMetaData.SETTING_NUMBER_OF_REPLICAS;
 import static org.elasticsearch.cluster.metadata.IndexMetaData.SETTING_NUMBER_OF_SHARDS;
 import static org.elasticsearch.cluster.routing.allocation.decider.DisableAllocationDecider.CLUSTER_ROUTING_ALLOCATION_DISABLE_ALLOCATION;
 import static org.elasticsearch.common.settings.Settings.builder;
-import static org.elasticsearch.index.shard.IndexShardState.*;
+import static org.elasticsearch.index.shard.IndexShardState.CLOSED;
+import static org.elasticsearch.index.shard.IndexShardState.CREATED;
+import static org.elasticsearch.index.shard.IndexShardState.POST_RECOVERY;
+import static org.elasticsearch.index.shard.IndexShardState.RECOVERING;
+import static org.elasticsearch.index.shard.IndexShardState.STARTED;
 import static org.elasticsearch.test.ESIntegTestCase.ClusterScope;
 import static org.elasticsearch.test.ESIntegTestCase.Scope;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
@@ -203,9 +207,7 @@ public class IndicesLifecycleListenerIT extends ESIntegTestCase {
     private static void assertShardStatesMatch(final IndexShardStateChangeListener stateChangeListener, final int numShards, final IndexShardState... shardStates)
             throws InterruptedException {
 
-        Predicate<Object> waitPredicate = new Predicate<Object>() {
+        BooleanSupplier waitPredicate = () -> {
-            @Override
-            public boolean apply(Object input) {
             if (stateChangeListener.shardStates.size() != numShards) {
                 return false;
             }
@@ -220,7 +222,6 @@ public class IndicesLifecycleListenerIT extends ESIntegTestCase {
                 }
             }
             return true;
-            }
         };
         if (!awaitBusy(waitPredicate, 1, TimeUnit.MINUTES)) {
             fail("failed to observe expect shard states\n" +

core/src/test/java/org/elasticsearch/indices/memory/IndexingMemoryControllerIT.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.indices.memory;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.cluster.ClusterName;
 import org.elasticsearch.cluster.metadata.IndexMetaData;
 import org.elasticsearch.common.settings.Settings;
@@ -54,13 +53,9 @@ public class IndexingMemoryControllerIT extends ESIntegTestCase {
         final long expected1ShardSize = internalCluster().getInstance(IndexingMemoryController.class).indexingBufferSize().bytes();
         final long expected2ShardsSize = expected1ShardSize / 2;
 
-        boolean success = awaitBusy(new Predicate<Object>() {
+        boolean success = awaitBusy(() -> shard1.engine().config().getIndexingBufferSize().bytes() <= expected2ShardsSize &&
-            @Override
+                        shard2.engine().config().getIndexingBufferSize().bytes() <= expected2ShardsSize
-            public boolean apply(Object input) {
+        );
-                return shard1.engine().config().getIndexingBufferSize().bytes() <= expected2ShardsSize &&
-                        shard2.engine().config().getIndexingBufferSize().bytes() <= expected2ShardsSize;
-            }
-        });
 
         if (!success) {
             fail("failed to update shard indexing buffer size. expected [" + expected2ShardsSize + "] shard1 [" +
@@ -70,12 +65,7 @@ public class IndexingMemoryControllerIT extends ESIntegTestCase {
         }
 
         client().admin().indices().prepareDelete("test2").get();
-        success = awaitBusy(new Predicate<Object>() {
+        success = awaitBusy(() -> shard1.engine().config().getIndexingBufferSize().bytes() >= expected1ShardSize);
-            @Override
-            public boolean apply(Object input) {
-                return  shard1.engine().config().getIndexingBufferSize().bytes() >= expected1ShardSize;
-            }
-        });
 
         if (!success) {
             fail("failed to update shard indexing buffer size after deleting shards. expected [" + expected1ShardSize + "] got [" +
@@ -95,12 +85,7 @@ public class IndexingMemoryControllerIT extends ESIntegTestCase {
         ensureGreen();
 
         final IndexShard shard1 = internalCluster().getInstance(IndicesService.class).indexService("test1").shard(0);
-        boolean success = awaitBusy(new Predicate<Object>() {
+        boolean success = awaitBusy(() -> shard1.engine().config().getIndexingBufferSize().bytes() == EngineConfig.INACTIVE_SHARD_INDEXING_BUFFER.bytes());
-            @Override
-            public boolean apply(Object input) {
-                return shard1.engine().config().getIndexingBufferSize().bytes() == EngineConfig.INACTIVE_SHARD_INDEXING_BUFFER.bytes();
-            }
-        });
         if (!success) {
             fail("failed to update shard indexing buffer size due to inactive state. expected [" + EngineConfig.INACTIVE_SHARD_INDEXING_BUFFER + "] got [" +
                             shard1.engine().config().getIndexingBufferSize().bytes() + "]"
@@ -109,12 +94,7 @@ public class IndexingMemoryControllerIT extends ESIntegTestCase {
 
         index("test1", "type", "1", "f", 1);
 
-        success = awaitBusy(new Predicate<Object>() {
+        success = awaitBusy(() -> shard1.engine().config().getIndexingBufferSize().bytes() > EngineConfig.INACTIVE_SHARD_INDEXING_BUFFER.bytes());
-            @Override
-            public boolean apply(Object input) {
-                return shard1.engine().config().getIndexingBufferSize().bytes() > EngineConfig.INACTIVE_SHARD_INDEXING_BUFFER.bytes();
-            }
-        });
         if (!success) {
             fail("failed to update shard indexing buffer size due to inactive state. expected something larger then [" + EngineConfig.INACTIVE_SHARD_INDEXING_BUFFER + "] got [" +
                             shard1.engine().config().getIndexingBufferSize().bytes() + "]"
@@ -123,12 +103,7 @@ public class IndexingMemoryControllerIT extends ESIntegTestCase {
 
         flush(); // clean translogs
 
-        success = awaitBusy(new Predicate<Object>() {
+        success = awaitBusy(() -> shard1.engine().config().getIndexingBufferSize().bytes() == EngineConfig.INACTIVE_SHARD_INDEXING_BUFFER.bytes());
-            @Override
-            public boolean apply(Object input) {
-                return shard1.engine().config().getIndexingBufferSize().bytes() == EngineConfig.INACTIVE_SHARD_INDEXING_BUFFER.bytes();
-            }
-        });
         if (!success) {
             fail("failed to update shard indexing buffer size due to inactive state. expected [" + EngineConfig.INACTIVE_SHARD_INDEXING_BUFFER + "] got [" +
                             shard1.engine().config().getIndexingBufferSize().bytes() + "]"

core/src/test/java/org/elasticsearch/indices/store/IndicesStoreIntegrationIT.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.indices.store;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.action.admin.cluster.health.ClusterHealthResponse;
 import org.elasticsearch.action.admin.cluster.health.ClusterHealthStatus;
 import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
@@ -55,7 +54,6 @@ import org.elasticsearch.test.disruption.BlockClusterStateProcessing;
 import org.elasticsearch.test.disruption.SingleNodeDisruption;
 import org.elasticsearch.test.junit.annotations.TestLogging;
 import org.elasticsearch.test.transport.MockTransportService;
-import org.elasticsearch.transport.TransportModule;
 import org.elasticsearch.transport.TransportRequestOptions;
 import org.elasticsearch.transport.TransportService;
 import org.junit.Test;
@@ -400,22 +398,12 @@ public class IndicesStoreIntegrationIT extends ESIntegTestCase {
     }
 
     private boolean waitForShardDeletion(final String server, final String index, final int shard) throws InterruptedException {
-        awaitBusy(new Predicate<Object>() {
+        awaitBusy(() -> !Files.exists(shardDirectory(server, index, shard)));
-            @Override
-            public boolean apply(Object o) {
-                return !Files.exists(shardDirectory(server, index, shard));
-            }
-        });
         return Files.exists(shardDirectory(server, index, shard));
     }
 
     private boolean waitForIndexDeletion(final String server, final String index) throws InterruptedException {
-        awaitBusy(new Predicate<Object>() {
+        awaitBusy(() -> !Files.exists(indexDirectory(server, index)));
-            @Override
-            public boolean apply(Object o) {
-                return !Files.exists(indexDirectory(server, index));
-            }
-        });
         return Files.exists(indexDirectory(server, index));
     }
 

core/src/test/java/org/elasticsearch/percolator/RecoveryPercolatorIT.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.percolator;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.action.admin.cluster.health.ClusterHealthResponse;
 import org.elasticsearch.action.admin.indices.delete.DeleteIndexResponse;
 import org.elasticsearch.action.count.CountResponse;
@@ -38,17 +37,27 @@ import org.junit.Test;
 
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.Predicate;
 
 import static org.elasticsearch.action.percolate.PercolateSourceBuilder.docBuilder;
 import static org.elasticsearch.client.Requests.clusterHealthRequest;
 import static org.elasticsearch.common.settings.Settings.settingsBuilder;
 import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
-import static org.elasticsearch.index.query.QueryBuilders.*;
+import static org.elasticsearch.index.query.QueryBuilders.matchAllQuery;
+import static org.elasticsearch.index.query.QueryBuilders.rangeQuery;
+import static org.elasticsearch.index.query.QueryBuilders.termQuery;
 import static org.elasticsearch.percolator.PercolatorIT.convertFromTextArray;
 import static org.elasticsearch.test.ESIntegTestCase.ClusterScope;
 import static org.elasticsearch.test.ESIntegTestCase.Scope;
-import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.*;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
-import static org.hamcrest.Matchers.*;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertHitCount;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertMatchCount;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoFailures;
+import static org.hamcrest.Matchers.arrayContainingInAnyOrder;
+import static org.hamcrest.Matchers.arrayWithSize;
+import static org.hamcrest.Matchers.emptyArray;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.nullValue;
 
 @ClusterScope(scope = Scope.TEST, numDataNodes = 0, numClientNodes = 0, transportClientRatio = 0)
 public class RecoveryPercolatorIT extends ESIntegTestCase {
@@ -239,12 +248,7 @@ public class RecoveryPercolatorIT extends ESIntegTestCase {
                 .get();
         ensureGreen();
 
-        final Client client = internalCluster().client(new Predicate<Settings>() {
+        final Client client = internalCluster().client(input -> input.getAsBoolean("node.stay", true));
-            @Override
-            public boolean apply(Settings input) {
-                return input.getAsBoolean("node.stay", true);
-            }
-        });
         final int numQueries = randomIntBetween(50, 100);
         logger.info("--> register a queries");
         for (int i = 0; i < numQueries; i++) {
@@ -314,12 +318,7 @@ public class RecoveryPercolatorIT extends ESIntegTestCase {
         };
         Thread t = new Thread(r);
         t.start();
-        Predicate<Settings> nodePredicate = new Predicate<Settings>() {
+        Predicate<Settings> nodePredicate = input -> !input.getAsBoolean("node.stay", false);
-            @Override
-            public boolean apply(Settings input) {
-                return !input.getAsBoolean("node.stay", false);
-            }
-        };
         try {
             // 1 index, 2 primaries, 2 replicas per primary
             for (int i = 0; i < 4; i++) {

core/src/test/java/org/elasticsearch/percolator/TTLPercolatorIT.java

@@ -19,8 +19,6 @@
 
 package org.elasticsearch.percolator;
 
-import com.google.common.base.Predicate;
-
 import org.elasticsearch.action.admin.indices.stats.IndicesStatsResponse;
 import org.elasticsearch.action.get.GetResponse;
 import org.elasticsearch.action.percolate.PercolateResponse;
@@ -42,7 +40,9 @@ import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
 import static org.elasticsearch.percolator.PercolatorIT.convertFromTextArray;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertMatchCount;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoFailures;
-import static org.hamcrest.Matchers.*;
+import static org.hamcrest.Matchers.arrayContaining;
+import static org.hamcrest.Matchers.emptyArray;
+import static org.hamcrest.Matchers.equalTo;
 
 /**
  */
@@ -136,14 +136,11 @@ public class TTLPercolatorIT extends ESIntegTestCase {
 
         // See comment in SimpleTTLTests
         logger.info("Checking if the ttl purger has run");
-        assertThat(awaitBusy(new Predicate<Object>() {
+        assertTrue(awaitBusy(() -> {
-            @Override
-            public boolean apply(Object input) {
             IndicesStatsResponse indicesStatsResponse = client.admin().indices().prepareStats("test").clear().setIndexing(true).get();
             // TTL deletes one doc, but it is indexed in the primary shard and replica shards
             return indicesStatsResponse.getIndices().get("test").getTotal().getIndexing().getTotal().getDeleteCount() == test.dataCopies;
-            }
+        }, 5, TimeUnit.SECONDS));
-        }, 5, TimeUnit.SECONDS), equalTo(true));
 
         percolateResponse = client.preparePercolate()
                 .setIndices("test").setDocumentType("type1")
@@ -200,15 +197,12 @@ public class TTLPercolatorIT extends ESIntegTestCase {
 
         }
         refresh();
-        assertThat(awaitBusy(new Predicate<Object>() {
+        assertTrue(awaitBusy(() -> {
-            @Override
-            public boolean apply(Object input) {
             IndicesStatsResponse indicesStatsResponse = client().admin().indices().prepareStats("test").clear().setIndexing(true).get();
             logger.debug("delete count [{}]", indicesStatsResponse.getIndices().get("test").getTotal().getIndexing().getTotal().getDeleteCount());
             // TTL deletes one doc, but it is indexed in the primary shard and replica shards
             return indicesStatsResponse.getIndices().get("test").getTotal().getIndexing().getTotal().getDeleteCount() != 0;
-            }
+        }, 5, TimeUnit.SECONDS));
-        }, 5, TimeUnit.SECONDS), equalTo(true));
         internalCluster().wipeIndices("test");
         client().admin().indices().prepareCreate("test")
                 .addMapping("type1", typeMapping)

core/src/test/java/org/elasticsearch/recovery/RecoveriesCollectionTests.java

@@ -18,8 +18,6 @@
  */
 package org.elasticsearch.recovery;
 
-import com.google.common.base.Predicate;
-import com.google.common.base.Predicates;
 import org.elasticsearch.Version;
 import org.elasticsearch.cluster.metadata.IndexMetaData;
 import org.elasticsearch.cluster.node.DiscoveryNode;
@@ -29,7 +27,11 @@ import org.elasticsearch.common.unit.TimeValue;
 import org.elasticsearch.index.shard.IndexShard;
 import org.elasticsearch.index.shard.ShardId;
 import org.elasticsearch.indices.IndicesService;
-import org.elasticsearch.indices.recovery.*;
+import org.elasticsearch.indices.recovery.RecoveriesCollection;
+import org.elasticsearch.indices.recovery.RecoveryFailedException;
+import org.elasticsearch.indices.recovery.RecoveryState;
+import org.elasticsearch.indices.recovery.RecoveryStatus;
+import org.elasticsearch.indices.recovery.RecoveryTarget;
 import org.elasticsearch.test.ESSingleNodeTestCase;
 import org.elasticsearch.threadpool.ThreadPool;
 import org.junit.Test;
@@ -38,6 +40,7 @@ import java.util.ArrayList;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.function.Predicate;
 
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.lessThan;
@@ -130,13 +133,8 @@ public class RecoveriesCollectionTests extends ESSingleNodeTestCase {
             RecoveriesCollection.StatusRef statusRef = collection.getStatus(recoveryId);
             toClose.add(statusRef);
             ShardId shardId = statusRef.status().shardId();
-            assertFalse("should not have cancelled recoveries", collection.cancelRecoveriesForShard(shardId, "test", Predicates.<RecoveryStatus>alwaysFalse()));
+            assertFalse("should not have cancelled recoveries", collection.cancelRecoveriesForShard(shardId, "test", status -> false));
-            final Predicate<RecoveryStatus> shouldCancel = new Predicate<RecoveryStatus>() {
+            final Predicate<RecoveryStatus> shouldCancel = status -> status.recoveryId() == recoveryId;
-                @Override
-                public boolean apply(RecoveryStatus status) {
-                    return status.recoveryId() == recoveryId;
-                }
-            };
             assertTrue("failed to cancel recoveries", collection.cancelRecoveriesForShard(shardId, "test", shouldCancel));
             assertThat("we should still have on recovery", collection.size(), equalTo(1));
             statusRef = collection.getStatus(recoveryId);

core/src/test/java/org/elasticsearch/recovery/RecoveryWhileUnderLoadIT.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.recovery;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.action.admin.indices.refresh.RefreshResponse;
 import org.elasticsearch.action.admin.indices.stats.IndicesStatsResponse;
 import org.elasticsearch.action.admin.indices.stats.ShardStats;
@@ -46,7 +45,6 @@ import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcke
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAllSuccessful;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertHitCount;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoTimeout;
-import static org.hamcrest.Matchers.equalTo;
 
 public class RecoveryWhileUnderLoadIT extends ESIntegTestCase {
 
@@ -289,19 +287,20 @@ public class RecoveryWhileUnderLoadIT extends ESIntegTestCase {
 
             //if there was an error we try to wait and see if at some point it'll get fixed
             logger.info("--> trying to wait");
-            assertThat(awaitBusy(new Predicate<Object>() {
+            assertTrue(awaitBusy(() -> {
-                @Override
+                                boolean errorOccurred = false;
-                public boolean apply(Object o) {
-                    boolean error = false;
                                 for (int i = 0; i < iterations; i++) {
                                     SearchResponse searchResponse = client().prepareSearch().setSize(0).setQuery(matchAllQuery()).get();
                                     if (searchResponse.getHits().totalHits() != numberOfDocs) {
-                            error = true;
+                                        errorOccurred = true;
                                     }
                                 }
-                    return !error;
+                                return !errorOccurred;
-                }
+                            },
-            }, 5, TimeUnit.MINUTES), equalTo(true));
+                            5,
+                            TimeUnit.MINUTES
+                    )
+            );
         }
 
         //lets now make the test fail if it was supposed to fail

core/src/test/java/org/elasticsearch/recovery/RelocationIT.java

@@ -21,7 +21,6 @@ package org.elasticsearch.recovery;
 
 import com.carrotsearch.hppc.IntHashSet;
 import com.carrotsearch.hppc.procedures.IntProcedure;
-import com.google.common.base.Predicate;
 import com.google.common.util.concurrent.ListenableFuture;
 import org.apache.lucene.index.IndexFileNames;
 import org.elasticsearch.action.admin.cluster.health.ClusterHealthResponse;
@@ -416,14 +415,11 @@ public class RelocationIT extends ESIntegTestCase {
 
         // Lets wait a bit and then move again to hopefully trigger recovery cancellations.
         boolean applied = awaitBusy(
-                new Predicate<Object>() {
+                () -> {
-                    @Override
+                    RecoveryResponse recoveryResponse =
-                    public boolean apply(Object input) {
+                            internalCluster().client(redNodeName).admin().indices().prepareRecoveries(indexName).get();
-                        RecoveryResponse recoveryResponse = internalCluster().client(redNodeName).admin().indices().prepareRecoveries(indexName)
-                                .get();
                     return !recoveryResponse.shardRecoveryStates().get(indexName).isEmpty();
                 }
-                }
         );
         assertTrue(applied);
         client().admin().indices().prepareUpdateSettings(indexName).setSettings(

core/src/test/java/org/elasticsearch/search/SearchWithRejectionsIT.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.search;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.action.admin.indices.stats.IndicesStatsResponse;
 import org.elasticsearch.action.search.SearchResponse;
 import org.elasticsearch.action.search.SearchType;
@@ -73,14 +72,7 @@ public class SearchWithRejectionsIT extends ESIntegTestCase {
             } catch (Throwable t) {
             }
         }
-        awaitBusy(new Predicate<Object>() {
+        awaitBusy(() -> client().admin().indices().prepareStats().execute().actionGet().getTotal().getSearch().getOpenContexts() == 0, 1, TimeUnit.SECONDS);
-            @Override
-            public boolean apply(Object input) {
-                // we must wait here because the requests to release search contexts might still be in flight
-                // although the search request has already returned
-                return client().admin().indices().prepareStats().execute().actionGet().getTotal().getSearch().getOpenContexts() == 0;
-            }
-        }, 1, TimeUnit.SECONDS);
         indicesStats = client().admin().indices().prepareStats().execute().actionGet();
         assertThat(indicesStats.getTotal().getSearch().getOpenContexts(), equalTo(0l));
     }

core/src/test/java/org/elasticsearch/snapshots/AbstractSnapshotIntegTestCase.java

@@ -18,7 +18,6 @@
  */
 package org.elasticsearch.snapshots;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
 import org.elasticsearch.action.admin.cluster.tasks.PendingClusterTasksResponse;
 import org.elasticsearch.cluster.ClusterChangedEvent;
@@ -49,6 +48,7 @@ import java.util.List;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.Predicate;
 
 import static org.elasticsearch.common.settings.Settings.settingsBuilder;
 import static org.hamcrest.Matchers.equalTo;
@@ -92,12 +92,7 @@ public abstract class AbstractSnapshotIntegTestCase extends ESIntegTestCase {
     }
 
     public static void stopNode(final String node) throws IOException {
-        internalCluster().stopRandomNode(new Predicate<Settings>() {
+        internalCluster().stopRandomNode(settings -> settings.get("name").equals(node));
-            @Override
-            public boolean apply(Settings settings) {
-                return settings.get("name").equals(node);
-            }
-        });
     }
 
     public void waitForBlock(String node, String repository, TimeValue timeout) throws InterruptedException {
@@ -186,18 +181,8 @@ public abstract class AbstractSnapshotIntegTestCase extends ESIntegTestCase {
 
         public BlockingClusterStateListener(ClusterService clusterService, final String blockOn, final String countOn, Priority passThroughPriority, TimeValue timeout) {
             this.clusterService = clusterService;
-            this.blockOn = new Predicate<ClusterChangedEvent>() {
+            this.blockOn = clusterChangedEvent -> clusterChangedEvent.source().startsWith(blockOn);
-                @Override
+            this.countOn = clusterChangedEvent -> clusterChangedEvent.source().startsWith(countOn);
-                public boolean apply(ClusterChangedEvent clusterChangedEvent) {
-                    return clusterChangedEvent.source().startsWith(blockOn);
-                }
-            };
-            this.countOn = new Predicate<ClusterChangedEvent>() {
-                @Override
-                public boolean apply(ClusterChangedEvent clusterChangedEvent) {
-                    return clusterChangedEvent.source().startsWith(countOn);
-                }
-            };
             this.latch = new CountDownLatch(1);
             this.passThroughPriority = passThroughPriority;
             this.timeout = timeout;
@@ -210,13 +195,13 @@ public abstract class AbstractSnapshotIntegTestCase extends ESIntegTestCase {
 
         @Override
         public void clusterChanged(ClusterChangedEvent event) {
-            if (blockOn.apply(event)) {
+            if (blockOn.test(event)) {
                 logger.info("blocking cluster state tasks on [{}]", event.source());
                 assert stopWaitingAt < 0; // Make sure we are the first time here
                 stopWaitingAt = System.currentTimeMillis() + timeout.getMillis();
                 addBlock();
             }
-            if (countOn.apply(event)) {
+            if (countOn.test(event)) {
                 count++;
             }
         }

core/src/test/java/org/elasticsearch/snapshots/SharedClusterSnapshotRestoreIT.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.snapshots;
 
-import com.google.common.base.Predicate;
 import com.google.common.collect.ImmutableMap;
 import org.apache.lucene.util.IOUtils;
 import org.elasticsearch.ExceptionsHelper;
@@ -84,8 +83,24 @@ import static org.elasticsearch.cluster.metadata.IndexMetaData.SETTING_NUMBER_OF
 import static org.elasticsearch.common.settings.Settings.settingsBuilder;
 import static org.elasticsearch.index.query.QueryBuilders.matchQuery;
 import static org.elasticsearch.index.shard.IndexShard.INDEX_REFRESH_INTERVAL;
-import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.*;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
-import static org.hamcrest.Matchers.*;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAliasesExist;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAliasesMissing;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAllSuccessful;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertBlocked;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertHitCount;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertIndexTemplateExists;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertIndexTemplateMissing;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoFailures;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertThrows;
+import static org.hamcrest.Matchers.allOf;
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.greaterThan;
+import static org.hamcrest.Matchers.lessThan;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.hamcrest.Matchers.nullValue;
+import static org.hamcrest.Matchers.startsWith;
 
 public class SharedClusterSnapshotRestoreIT extends AbstractSnapshotIntegTestCase {
 
@@ -1857,21 +1872,11 @@ public class SharedClusterSnapshotRestoreIT extends AbstractSnapshotIntegTestCas
     }
 
     private boolean waitForIndex(final String index, TimeValue timeout) throws InterruptedException {
-        return awaitBusy(new Predicate<Object>() {
+        return awaitBusy(() -> client().admin().indices().prepareExists(index).execute().actionGet().isExists(), timeout.millis(), TimeUnit.MILLISECONDS);
-            @Override
-            public boolean apply(Object o) {
-                return client().admin().indices().prepareExists(index).execute().actionGet().isExists();
-            }
-        }, timeout.millis(), TimeUnit.MILLISECONDS);
     }
 
     private boolean waitForRelocationsToStart(final String index, TimeValue timeout) throws InterruptedException {
-        return awaitBusy(new Predicate<Object>() {
+        return awaitBusy(() -> client().admin().cluster().prepareHealth(index).execute().actionGet().getRelocatingShards() > 0, timeout.millis(), TimeUnit.MILLISECONDS);
-            @Override
-            public boolean apply(Object o) {
-                return client().admin().cluster().prepareHealth(index).execute().actionGet().getRelocatingShards() > 0;
-            }
-        }, timeout.millis(), TimeUnit.MILLISECONDS);
     }
 
     @Test

core/src/test/java/org/elasticsearch/test/CompositeTestCluster.java

@@ -19,8 +19,6 @@
 package org.elasticsearch.test;
 
 import com.carrotsearch.randomizedtesting.generators.RandomPicks;
-import com.google.common.base.Predicate;
-import com.google.common.collect.Collections2;
 import com.google.common.collect.Iterators;
 import org.apache.lucene.util.IOUtils;
 import org.elasticsearch.action.admin.cluster.node.stats.NodeStats;
@@ -33,10 +31,12 @@ import org.elasticsearch.common.transport.TransportAddress;
 
 import java.io.IOException;
 import java.net.InetSocketAddress;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.Random;
+import java.util.stream.Collectors;
 
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoTimeout;
 import static org.hamcrest.Matchers.equalTo;
@@ -90,12 +90,10 @@ public class CompositeTestCluster extends TestCluster {
     }
 
     private Collection<ExternalNode> runningNodes() {
-        return Collections2.filter(Arrays.asList(externalNodes), new Predicate<ExternalNode>() {
+        return Arrays
-            @Override
+                .stream(externalNodes)
-            public boolean apply(ExternalNode input) {
+                .filter(input -> input.running())
-                return input.running();
+                .collect(Collectors.toCollection(ArrayList::new));
-            }
-        });
     }
 
     /**

core/src/test/java/org/elasticsearch/test/ESIntegTestCase.java

@@ -25,15 +25,7 @@ import com.carrotsearch.randomizedtesting.annotations.TestGroup;
 import com.carrotsearch.randomizedtesting.generators.RandomInts;
 import com.carrotsearch.randomizedtesting.generators.RandomPicks;
 import com.google.common.base.Joiner;
-import com.google.common.base.Predicate;
 import org.apache.http.impl.client.HttpClients;
-import org.elasticsearch.action.search.SearchResponse;
-import org.elasticsearch.action.admin.cluster.state.ClusterStateResponse;
-import org.elasticsearch.cluster.metadata.IndexMetaData;
-import org.elasticsearch.cluster.routing.UnassignedInfo;
-import org.elasticsearch.cluster.routing.allocation.decider.EnableAllocationDecider;
-import org.elasticsearch.common.network.NetworkAddress;
-import org.elasticsearch.index.shard.MergeSchedulerConfig;
 import org.apache.lucene.util.IOUtils;
 import org.apache.lucene.util.LuceneTestCase;
 import org.apache.lucene.util.TestUtil;
@@ -63,6 +55,7 @@ import org.elasticsearch.action.get.GetResponse;
 import org.elasticsearch.action.index.IndexRequestBuilder;
 import org.elasticsearch.action.index.IndexResponse;
 import org.elasticsearch.action.search.ClearScrollResponse;
+import org.elasticsearch.action.search.SearchResponse;
 import org.elasticsearch.action.support.IndicesOptions;
 import org.elasticsearch.client.AdminClient;
 import org.elasticsearch.client.Client;
@@ -164,6 +157,7 @@ import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicLong;
+import java.util.function.BooleanSupplier;
 
 import static org.elasticsearch.cluster.metadata.IndexMetaData.SETTING_NUMBER_OF_REPLICAS;
 import static org.elasticsearch.cluster.metadata.IndexMetaData.SETTING_NUMBER_OF_SHARDS;
@@ -172,8 +166,14 @@ import static org.elasticsearch.common.util.CollectionUtils.eagerPartition;
 import static org.elasticsearch.index.query.QueryBuilders.matchAllQuery;
 import static org.elasticsearch.test.XContentTestUtils.convertToMap;
 import static org.elasticsearch.test.XContentTestUtils.differenceBetweenMapsIgnoringArrayOrder;
-import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.*;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
-import static org.hamcrest.Matchers.*;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoFailures;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoTimeout;
+import static org.hamcrest.Matchers.emptyIterable;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.hamcrest.Matchers.startsWith;
 
 /**
  * {@link ESIntegTestCase} is an abstract base class to run integration
@@ -1000,9 +1000,7 @@ public abstract class ESIntegTestCase extends ESTestCase {
             throws InterruptedException {
         final AtomicLong lastKnownCount = new AtomicLong(-1);
         long lastStartCount = -1;
-        Predicate<Object> testDocs = new Predicate<Object>() {
+        BooleanSupplier testDocs = () -> {
-            @Override
-            public boolean apply(Object o) {
             if (indexer != null) {
                 lastKnownCount.set(indexer.totalIndexedDocs());
             }
@@ -1023,7 +1021,6 @@ public abstract class ESIntegTestCase extends ESTestCase {
                 logger.debug("[{}] docs indexed. waiting for [{}]", lastKnownCount.get(), numDocs);
             }
             return lastKnownCount.get() >= numDocs;
-            }
         };
 
         while (!awaitBusy(testDocs, maxWaitTime, maxWaitTimeUnit)) {

core/src/test/java/org/elasticsearch/test/ESTestCase.java

@@ -29,7 +29,6 @@ import com.carrotsearch.randomizedtesting.generators.RandomInts;
 import com.carrotsearch.randomizedtesting.generators.RandomPicks;
 import com.carrotsearch.randomizedtesting.generators.RandomStrings;
 import com.carrotsearch.randomizedtesting.rules.TestRuleAdapter;
-import com.google.common.base.Predicate;
 import org.apache.lucene.uninverting.UninvertingReader;
 import org.apache.lucene.util.LuceneTestCase;
 import org.apache.lucene.util.LuceneTestCase.SuppressCodecs;
@@ -79,6 +78,8 @@ import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
+import java.util.function.BooleanSupplier;
+import java.util.function.Predicate;
 
 import static org.elasticsearch.common.util.CollectionUtils.arrayAsArrayList;
 import static org.hamcrest.Matchers.equalTo;
@@ -438,19 +439,19 @@ public abstract class ESTestCase extends LuceneTestCase {
         }
     }
 
-    public static boolean awaitBusy(Predicate<?> breakPredicate) throws InterruptedException {
+    public static boolean awaitBusy(BooleanSupplier breakSupplier) throws InterruptedException {
-        return awaitBusy(breakPredicate, 10, TimeUnit.SECONDS);
+        return awaitBusy(breakSupplier, 10, TimeUnit.SECONDS);
     }
 
     // After 1s, we stop growing the sleep interval exponentially and just sleep 1s until maxWaitTime
     private static final long AWAIT_BUSY_THRESHOLD = 1000L;
 
-    public static boolean awaitBusy(Predicate<?> breakPredicate, long maxWaitTime, TimeUnit unit) throws InterruptedException {
+    public static boolean awaitBusy(BooleanSupplier breakSupplier, long maxWaitTime, TimeUnit unit) throws InterruptedException {
         long maxTimeInMillis = TimeUnit.MILLISECONDS.convert(maxWaitTime, unit);
         long timeInMillis = 1;
         long sum = 0;
         while (sum + timeInMillis < maxTimeInMillis) {
-            if (breakPredicate.apply(null)) {
+            if (breakSupplier.getAsBoolean()) {
                 return true;
             }
             Thread.sleep(timeInMillis);
@@ -459,7 +460,7 @@ public abstract class ESTestCase extends LuceneTestCase {
         }
         timeInMillis = maxTimeInMillis - sum;
         Thread.sleep(Math.max(timeInMillis, 0));
-        return breakPredicate.apply(null);
+        return breakSupplier.getAsBoolean();
     }
 
     public static boolean terminate(ExecutorService... services) throws InterruptedException {

core/src/test/java/org/elasticsearch/test/ExternalNode.java

@@ -18,8 +18,6 @@
  */
 package org.elasticsearch.test;
 
-import com.google.common.base.Predicate;
-
 import org.apache.lucene.util.Constants;
 import org.elasticsearch.action.admin.cluster.node.info.NodeInfo;
 import org.elasticsearch.action.admin.cluster.node.info.NodesInfoResponse;
@@ -155,9 +153,7 @@ final class ExternalNode implements Closeable {
     }
 
     static boolean waitForNode(final Client client, final String name) throws InterruptedException {
-        return ESTestCase.awaitBusy(new Predicate<Object>() {
+        return ESTestCase.awaitBusy(() -> {
-            @Override
-            public boolean apply(java.lang.Object input) {
             final NodesInfoResponse nodeInfos = client.admin().cluster().prepareNodesInfo().get();
             final NodeInfo[] nodes = nodeInfos.getNodes();
             for (NodeInfo info : nodes) {
@@ -166,7 +162,6 @@ final class ExternalNode implements Closeable {
                 }
             }
             return false;
-            }
         }, 30, TimeUnit.SECONDS);
     }
 

core/src/test/java/org/elasticsearch/test/InternalTestCluster.java

@@ -24,12 +24,7 @@ import com.carrotsearch.randomizedtesting.SysGlobals;
 import com.carrotsearch.randomizedtesting.generators.RandomInts;
 import com.carrotsearch.randomizedtesting.generators.RandomPicks;
 import com.carrotsearch.randomizedtesting.generators.RandomStrings;
-import com.google.common.base.Predicate;
-import com.google.common.base.Predicates;
-import com.google.common.collect.Collections2;
-import com.google.common.collect.Iterables;
 import com.google.common.collect.Iterators;
-import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
@@ -127,13 +122,20 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 import static junit.framework.Assert.fail;
-import static org.apache.lucene.util.LuceneTestCase.*;
+import static org.apache.lucene.util.LuceneTestCase.TEST_NIGHTLY;
+import static org.apache.lucene.util.LuceneTestCase.rarely;
+import static org.apache.lucene.util.LuceneTestCase.usually;
 import static org.elasticsearch.common.settings.Settings.settingsBuilder;
 import static org.elasticsearch.test.ESTestCase.assertBusy;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoTimeout;
-import static org.hamcrest.Matchers.*;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.greaterThan;
+import static org.hamcrest.Matchers.greaterThanOrEqualTo;
 import static org.junit.Assert.assertThat;
 
 /**
@@ -532,14 +534,13 @@ public final class InternalTestCluster extends TestCluster {
     }
 
     private synchronized NodeAndClient getRandomNodeAndClient() {
-        Predicate<NodeAndClient> all = Predicates.alwaysTrue();
+        return getRandomNodeAndClient(nc -> true);
-        return getRandomNodeAndClient(all);
     }
 
 
     private synchronized NodeAndClient getRandomNodeAndClient(Predicate<NodeAndClient> predicate) {
         ensureOpen();
-        Collection<NodeAndClient> values = Collections2.filter(nodes.values(), predicate);
+        Collection<NodeAndClient> values = nodes.values().stream().filter(predicate).collect(Collectors.toCollection(ArrayList::new));
         if (!values.isEmpty()) {
             int whichOne = random.nextInt(values.size());
             for (NodeAndClient nodeAndClient : values) {
@@ -588,8 +589,9 @@ public final class InternalTestCluster extends TestCluster {
             return;
         }
         // prevent killing the master if possible and client nodes
-        final Iterator<NodeAndClient> values = n == 0 ? nodes.values().iterator() : Iterators.filter(nodes.values().iterator(),
+        final Stream<NodeAndClient> collection =
-                Predicates.and(new DataNodePredicate(), Predicates.not(new MasterNodePredicate(getMasterName()))));
+                n == 0 ? nodes.values().stream() : nodes.values().stream().filter(new DataNodePredicate().and(new MasterNodePredicate(getMasterName()).negate()));
+        final Iterator<NodeAndClient> values = collection.iterator();
 
         final Iterator<NodeAndClient> limit = Iterators.limit(values, size - n);
         logger.info("changing cluster size from {} to {}, {} data nodes", size(), n + numSharedClientNodes, n);
@@ -682,7 +684,7 @@ public final class InternalTestCluster extends TestCluster {
      */
     public synchronized Client nonMasterClient() {
         ensureOpen();
-        NodeAndClient randomNodeAndClient = getRandomNodeAndClient(Predicates.not(new MasterNodePredicate(getMasterName())));
+        NodeAndClient randomNodeAndClient = getRandomNodeAndClient(new MasterNodePredicate(getMasterName()).negate());
         if (randomNodeAndClient != null) {
             return randomNodeAndClient.nodeClient(); // ensure node client non-master is requested
         }
@@ -758,12 +760,7 @@ public final class InternalTestCluster extends TestCluster {
      */
     public synchronized Client client(final Predicate<Settings> filterPredicate) {
         ensureOpen();
-        final NodeAndClient randomNodeAndClient = getRandomNodeAndClient(new Predicate<NodeAndClient>() {
+        final NodeAndClient randomNodeAndClient = getRandomNodeAndClient(nodeAndClient -> filterPredicate.test(nodeAndClient.node.settings()));
-            @Override
-            public boolean apply(NodeAndClient nodeAndClient) {
-                return filterPredicate.apply(nodeAndClient.node.settings());
-            }
-        });
         if (randomNodeAndClient != null) {
             return randomNodeAndClient.client(random);
         }
@@ -1145,7 +1142,7 @@ public final class InternalTestCluster extends TestCluster {
     }
 
     private synchronized <T> Iterable<T> getInstances(Class<T> clazz, Predicate<NodeAndClient> predicate) {
-        Iterable<NodeAndClient> filteredNodes = Iterables.filter(nodes.values(), predicate);
+        Iterable<NodeAndClient> filteredNodes = nodes.values().stream().filter(predicate)::iterator;
         List<T> instances = new ArrayList<>();
         for (NodeAndClient nodeAndClient : filteredNodes) {
             instances.add(getInstanceFromNode(clazz, nodeAndClient.node));
@@ -1157,18 +1154,7 @@ public final class InternalTestCluster extends TestCluster {
      * Returns a reference to the given nodes instances of the given class &gt;T&lt;
      */
     public synchronized <T> T getInstance(Class<T> clazz, final String node) {
-        final Predicate<InternalTestCluster.NodeAndClient> predicate;
+        return getInstance(clazz, nc -> node == null || node.equals(nc.name));
-        if (node != null) {
-            predicate = new Predicate<InternalTestCluster.NodeAndClient>() {
-                @Override
-                public boolean apply(NodeAndClient nodeAndClient) {
-                    return node.equals(nodeAndClient.name);
-                }
-            };
-        } else {
-            predicate = Predicates.alwaysTrue();
-        }
-        return getInstance(clazz, predicate);
     }
 
     public synchronized <T> T getDataNodeInstance(Class<T> clazz) {
@@ -1185,7 +1171,7 @@ public final class InternalTestCluster extends TestCluster {
      * Returns a reference to a random nodes instances of the given class &gt;T&lt;
      */
     public synchronized <T> T getInstance(Class<T> clazz) {
-        return getInstance(clazz, Predicates.<NodeAndClient>alwaysTrue());
+        return getInstance(clazz, nc -> true);
     }
 
     private synchronized <T> T getInstanceFromNode(Class<T> clazz, Node node) {
@@ -1228,12 +1214,7 @@ public final class InternalTestCluster extends TestCluster {
      */
     public synchronized void stopRandomNode(final Predicate<Settings> filter) throws IOException {
         ensureOpen();
-        NodeAndClient nodeAndClient = getRandomNodeAndClient(new Predicate<InternalTestCluster.NodeAndClient>() {
+        NodeAndClient nodeAndClient = getRandomNodeAndClient(nc -> filter.test(nc.node.settings()));
-            @Override
-            public boolean apply(NodeAndClient nodeAndClient) {
-                return filter.apply(nodeAndClient.node.settings());
-            }
-        });
         if (nodeAndClient != null) {
             logger.info("Closing filtered random node [{}] ", nodeAndClient.name);
             removeDisruptionSchemeFromNode(nodeAndClient);
@@ -1260,7 +1241,7 @@ public final class InternalTestCluster extends TestCluster {
      * Stops the any of the current nodes but not the master node.
      */
     public void stopRandomNonMasterNode() throws IOException {
-        NodeAndClient nodeAndClient = getRandomNodeAndClient(Predicates.not(new MasterNodePredicate(getMasterName())));
+        NodeAndClient nodeAndClient = getRandomNodeAndClient(new MasterNodePredicate(getMasterName()).negate());
         if (nodeAndClient != null) {
             logger.info("Closing random non master node [{}] current master [{}] ", nodeAndClient.name, getMasterName());
             removeDisruptionSchemeFromNode(nodeAndClient);
@@ -1280,7 +1261,7 @@ public final class InternalTestCluster extends TestCluster {
      * Restarts a random node in the cluster and calls the callback during restart.
      */
     public void restartRandomNode(RestartCallback callback) throws Exception {
-        restartRandomNode(Predicates.<NodeAndClient>alwaysTrue(), callback);
+        restartRandomNode(nc -> true, callback);
     }
 
     /**
@@ -1442,7 +1423,12 @@ public final class InternalTestCluster extends TestCluster {
 
     private synchronized Set<String> nRandomDataNodes(int numNodes) {
         assert size() >= numNodes;
-        NavigableMap<String, NodeAndClient> dataNodes = Maps.filterEntries(nodes, new EntryNodePredicate(new DataNodePredicate()));
+        Map<String, NodeAndClient> dataNodes =
+                nodes
+                        .entrySet()
+                        .stream()
+                        .filter(new EntryNodePredicate(new DataNodePredicate()))
+                        .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
         return Sets.newHashSet(Iterators.limit(dataNodes.keySet().iterator(), numNodes));
     }
 
@@ -1676,23 +1662,31 @@ public final class InternalTestCluster extends TestCluster {
     }
 
     private synchronized Collection<NodeAndClient> dataNodeAndClients() {
-        return Collections2.filter(nodes.values(), new DataNodePredicate());
+        return filterNodes(nodes, new DataNodePredicate());
     }
 
     private synchronized Collection<NodeAndClient> dataAndMasterNodes() {
-        return Collections2.filter(nodes.values(), new DataOrMasterNodePredicate());
+        return filterNodes(nodes, new DataOrMasterNodePredicate());
+    }
+
+    private synchronized Collection<NodeAndClient> filterNodes(Map<String, InternalTestCluster.NodeAndClient> map, Predicate<NodeAndClient> predicate) {
+        return map
+                .values()
+                .stream()
+                .filter(predicate)
+                .collect(Collectors.toCollection(ArrayList::new));
     }
 
     private static final class DataNodePredicate implements Predicate<NodeAndClient> {
         @Override
-        public boolean apply(NodeAndClient nodeAndClient) {
+        public boolean test(NodeAndClient nodeAndClient) {
             return DiscoveryNode.dataNode(nodeAndClient.node.settings());
         }
     }
 
     private static final class DataOrMasterNodePredicate implements Predicate<NodeAndClient> {
         @Override
-        public boolean apply(NodeAndClient nodeAndClient) {
+        public boolean test(NodeAndClient nodeAndClient) {
             return DiscoveryNode.dataNode(nodeAndClient.node.settings()) ||
                     DiscoveryNode.masterNode(nodeAndClient.node.settings());
         }
@@ -1706,14 +1700,14 @@ public final class InternalTestCluster extends TestCluster {
         }
 
         @Override
-        public boolean apply(NodeAndClient nodeAndClient) {
+        public boolean test(NodeAndClient nodeAndClient) {
             return masterNodeName.equals(nodeAndClient.name);
         }
     }
 
     private static final class ClientNodePredicate implements Predicate<NodeAndClient> {
         @Override
-        public boolean apply(NodeAndClient nodeAndClient) {
+        public boolean test(NodeAndClient nodeAndClient) {
             return DiscoveryNode.clientNode(nodeAndClient.node.settings());
         }
     }
@@ -1726,8 +1720,8 @@ public final class InternalTestCluster extends TestCluster {
         }
 
         @Override
-        public boolean apply(Map.Entry<String, NodeAndClient> entry) {
+        public boolean test(Map.Entry<String, NodeAndClient> entry) {
-            return delegateNodePredicate.apply(entry.getValue());
+            return delegateNodePredicate.test(entry.getValue());
         }
     }
 
@@ -1795,7 +1789,7 @@ public final class InternalTestCluster extends TestCluster {
         }
 
         @Override
-        public boolean apply(Settings settings) {
+        public boolean test(Settings settings) {
             return nodeNames.contains(settings.get("name"));
 
         }

core/src/test/java/org/elasticsearch/test/hamcrest/ElasticsearchAssertions.java

@@ -18,11 +18,6 @@
  */
 package org.elasticsearch.test.hamcrest;
 
-import com.google.common.base.Function;
-import com.google.common.base.Predicate;
-import com.google.common.base.Predicates;
-import com.google.common.collect.FluentIterable;
-import com.google.common.collect.Iterables;
 import org.apache.lucene.search.BooleanQuery;
 import org.apache.lucene.search.Query;
 import org.elasticsearch.ElasticsearchException;
@@ -35,7 +30,6 @@ import org.elasticsearch.action.ShardOperationFailedException;
 import org.elasticsearch.action.admin.cluster.health.ClusterHealthRequestBuilder;
 import org.elasticsearch.action.admin.cluster.health.ClusterHealthResponse;
 import org.elasticsearch.action.admin.cluster.node.info.NodesInfoResponse;
-import org.elasticsearch.plugins.PluginInfo;
 import org.elasticsearch.action.admin.cluster.node.info.PluginsInfo;
 import org.elasticsearch.action.admin.indices.alias.exists.AliasesExistResponse;
 import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequestBuilder;
@@ -62,6 +56,7 @@ import org.elasticsearch.common.io.stream.BytesStreamOutput;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.io.stream.Streamable;
+import org.elasticsearch.plugins.PluginInfo;
 import org.elasticsearch.rest.RestStatus;
 import org.elasticsearch.search.SearchHit;
 import org.elasticsearch.search.suggest.Suggest;
@@ -77,16 +72,36 @@ import java.lang.reflect.Constructor;
 import java.lang.reflect.InvocationTargetException;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Locale;
+import java.util.Set;
+import java.util.function.Function;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
 
-import static com.google.common.base.Predicates.isNull;
+import static org.elasticsearch.test.ESTestCase.assertArrayEquals;
-import static com.google.common.base.Predicates.notNull;
+import static org.elasticsearch.test.ESTestCase.assertEquals;
-import static org.elasticsearch.test.ESTestCase.*;
+import static org.elasticsearch.test.ESTestCase.assertFalse;
+import static org.elasticsearch.test.ESTestCase.assertNotNull;
+import static org.elasticsearch.test.ESTestCase.assertTrue;
+import static org.elasticsearch.test.ESTestCase.fail;
+import static org.elasticsearch.test.ESTestCase.random;
 import static org.elasticsearch.test.VersionUtils.randomVersion;
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.hamcrest.CoreMatchers.is;
 import static org.hamcrest.MatcherAssert.assertThat;
-import static org.hamcrest.Matchers.*;
+import static org.hamcrest.Matchers.contains;
+import static org.hamcrest.Matchers.greaterThan;
+import static org.hamcrest.Matchers.greaterThanOrEqualTo;
+import static org.hamcrest.Matchers.hasItem;
+import static org.hamcrest.Matchers.hasKey;
+import static org.hamcrest.Matchers.instanceOf;
+import static org.hamcrest.Matchers.not;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.hamcrest.Matchers.nullValue;
 
 /**
  *
@@ -739,91 +754,68 @@ public class ElasticsearchAssertions {
         PluginsInfo plugins = response.getNodesMap().get(nodeId).getPlugins();
         Assert.assertThat(plugins, notNullValue());
 
-        List<String> pluginNames = FluentIterable.from(plugins.getInfos()).filter(jvmPluginPredicate).transform(nameFunction).toList();
+        List<String> pluginNames = filterAndMap(plugins, jvmPluginPredicate, nameFunction);
         for (String expectedJvmPluginName : expectedJvmPluginNames) {
             Assert.assertThat(pluginNames, hasItem(expectedJvmPluginName));
         }
 
-        List<String> pluginDescriptions = FluentIterable.from(plugins.getInfos()).filter(jvmPluginPredicate).transform(descriptionFunction).toList();
+        List<String> pluginDescriptions = filterAndMap(plugins, jvmPluginPredicate, descriptionFunction);
         for (String expectedJvmPluginDescription : expectedJvmPluginDescriptions) {
             Assert.assertThat(pluginDescriptions, hasItem(expectedJvmPluginDescription));
         }
 
-        List<String> jvmPluginVersions = FluentIterable.from(plugins.getInfos()).filter(jvmPluginPredicate).transform(versionFunction).toList();
+        List<String> jvmPluginVersions = filterAndMap(plugins, jvmPluginPredicate, versionFunction);
         for (String pluginVersion : expectedJvmVersions) {
             Assert.assertThat(jvmPluginVersions, hasItem(pluginVersion));
         }
 
-        FluentIterable<String> jvmUrls = FluentIterable.from(plugins.getInfos())
+        boolean anyHaveUrls =
-                .filter(Predicates.and(jvmPluginPredicate, Predicates.not(sitePluginPredicate)))
+                plugins
-                .transform(urlFunction)
+                        .getInfos()
-                .filter(notNull());
+                        .stream()
-        Assert.assertThat(Iterables.size(jvmUrls), is(0));
+                        .filter(jvmPluginPredicate.and(sitePluginPredicate.negate()))
+                        .map(urlFunction)
+                        .anyMatch(p -> p != null);
+        assertFalse(anyHaveUrls);
+
+        List<String> sitePluginNames = filterAndMap(plugins, sitePluginPredicate, nameFunction);
 
-        List<String> sitePluginNames = FluentIterable.from(plugins.getInfos()).filter(sitePluginPredicate).transform(nameFunction).toList();
         Assert.assertThat(sitePluginNames.isEmpty(), is(expectedSitePluginNames.isEmpty()));
         for (String expectedSitePluginName : expectedSitePluginNames) {
             Assert.assertThat(sitePluginNames, hasItem(expectedSitePluginName));
         }
 
-        List<String> sitePluginDescriptions = FluentIterable.from(plugins.getInfos()).filter(sitePluginPredicate).transform(descriptionFunction).toList();
+        List<String> sitePluginDescriptions = filterAndMap(plugins, sitePluginPredicate, descriptionFunction);
         Assert.assertThat(sitePluginDescriptions.isEmpty(), is(expectedSitePluginDescriptions.isEmpty()));
         for (String sitePluginDescription : expectedSitePluginDescriptions) {
             Assert.assertThat(sitePluginDescriptions, hasItem(sitePluginDescription));
         }
 
-        List<String> sitePluginUrls = FluentIterable.from(plugins.getInfos()).filter(sitePluginPredicate).transform(urlFunction).toList();
+        List<String> sitePluginUrls = filterAndMap(plugins, sitePluginPredicate, urlFunction);
         Assert.assertThat(sitePluginUrls, not(contains(nullValue())));
 
-
+        List<String> sitePluginVersions = filterAndMap(plugins, sitePluginPredicate, versionFunction);
-        List<String> sitePluginVersions = FluentIterable.from(plugins.getInfos()).filter(sitePluginPredicate).transform(versionFunction).toList();
         Assert.assertThat(sitePluginVersions.isEmpty(), is(expectedSiteVersions.isEmpty()));
         for (String pluginVersion : expectedSiteVersions) {
             Assert.assertThat(sitePluginVersions, hasItem(pluginVersion));
         }
     }
 
-    private static Predicate<PluginInfo> jvmPluginPredicate = new Predicate<PluginInfo>() {
+    private static List<String> filterAndMap(PluginsInfo pluginsInfo, Predicate<PluginInfo> predicate, Function<PluginInfo, String> function) {
-        @Override
+        return pluginsInfo.getInfos().stream().filter(predicate).map(function).collect(Collectors.toList());
-        public boolean apply(PluginInfo pluginInfo) {
-            return pluginInfo.isJvm();
     }
-    };
 
-    private static Predicate<PluginInfo> sitePluginPredicate = new Predicate<PluginInfo>() {
+    private static Predicate<PluginInfo> jvmPluginPredicate = p -> p.isJvm();
-        @Override
-        public boolean apply(PluginInfo pluginInfo) {
-            return pluginInfo.isSite();
-        }
-    };
 
-    private static Function<PluginInfo, String> nameFunction = new Function<PluginInfo, String>() {
+    private static Predicate<PluginInfo> sitePluginPredicate = p -> p.isSite();
-        @Override
-        public String apply(PluginInfo pluginInfo) {
-            return pluginInfo.getName();
-        }
-    };
 
-    private static Function<PluginInfo, String> descriptionFunction = new Function<PluginInfo, String>() {
+    private static Function<PluginInfo, String> nameFunction = p -> p.getName();
-        @Override
-        public String apply(PluginInfo pluginInfo) {
-            return pluginInfo.getDescription();
-        }
-    };
 
-    private static Function<PluginInfo, String> urlFunction = new Function<PluginInfo, String>() {
+    private static Function<PluginInfo, String> descriptionFunction = p -> p.getDescription();
-        @Override
-        public String apply(PluginInfo pluginInfo) {
-            return pluginInfo.getUrl();
-        }
-    };
 
-    private static Function<PluginInfo, String> versionFunction = new Function<PluginInfo, String>() {
+    private static Function<PluginInfo, String> urlFunction = p -> p.getUrl();
-        @Override
+
-        public String apply(PluginInfo pluginInfo) {
+    private static Function<PluginInfo, String> versionFunction = p -> p.getVersion();
-            return pluginInfo.getVersion();
-        }
-    };
 
     /**
      * Check if a file exists

core/src/test/java/org/elasticsearch/ttl/SimpleTTLIT.java

@@ -19,8 +19,6 @@
 
 package org.elasticsearch.ttl;
 
-import com.google.common.base.Predicate;
-
 import org.elasticsearch.action.admin.indices.mapping.get.GetMappingsResponse;
 import org.elasticsearch.action.admin.indices.mapping.put.PutMappingResponse;
 import org.elasticsearch.action.admin.indices.stats.IndicesStatsResponse;
@@ -31,7 +29,6 @@ import org.elasticsearch.action.update.UpdateResponse;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.common.xcontent.XContentFactory;
-import org.elasticsearch.index.get.GetField;
 import org.elasticsearch.test.ESIntegTestCase;
 import org.elasticsearch.test.ESIntegTestCase.ClusterScope;
 import org.elasticsearch.test.ESIntegTestCase.Scope;
@@ -44,7 +41,6 @@ import java.util.concurrent.TimeUnit;
 import static org.elasticsearch.common.settings.Settings.settingsBuilder;
 import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
-import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoFailures;
 import static org.hamcrest.Matchers.both;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.greaterThan;
@@ -170,19 +166,18 @@ public class SimpleTTLIT extends ESIntegTestCase {
         // But we can use index statistics' delete count to be sure that deletes have been executed, that must be incremented before
         // ttl purging has finished.
         logger.info("--> checking purger");
-        assertThat(awaitBusy(new Predicate<Object>() {
+        assertTrue(awaitBusy(() -> {
-            @Override
-            public boolean apply(Object input) {
                     if (rarely()) {
                         client().admin().indices().prepareFlush("test").get();
                     } else if (rarely()) {
                         client().admin().indices().prepareOptimize("test").setMaxNumSegments(1).get();
                     }
-                IndicesStatsResponse response = client().admin().indices().prepareStats("test").clear().setIndexing(true).get();
+                    IndicesStatsResponse indicesStatsResponse = client().admin().indices().prepareStats("test").clear().setIndexing(true).get();
                     // TTL deletes two docs, but it is indexed in the primary shard and replica shard.
-                return response.getIndices().get("test").getTotal().getIndexing().getTotal().getDeleteCount() == 2L * test.dataCopies;
+                    return indicesStatsResponse.getIndices().get("test").getTotal().getIndexing().getTotal().getDeleteCount() == 2L * test.dataCopies;
-            }
+                },
-        }, 5, TimeUnit.SECONDS), equalTo(true));
+                5, TimeUnit.SECONDS
+        ));
 
         // realtime get check
         getResponse = client().prepareGet("test", "type1", "1").setFields("_ttl").setRealtime(true).execute().actionGet();

dev-tools/src/main/resources/forbidden/core-signatures.txt

@@ -88,3 +88,5 @@ org.elasticsearch.common.io.PathUtils#get(java.net.URI)
 com.google.common.collect.Lists
 com.google.common.collect.ImmutableList
 com.google.common.base.Objects
+com.google.common.base.Predicate
+com.google.common.base.Predicates

plugins/delete-by-query/src/test/java/org/elasticsearch/action/deletebyquery/TransportDeleteByQueryActionTests.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.action.deletebyquery;
 
-import com.google.common.base.Predicate;
 import org.elasticsearch.action.ActionListener;
 import org.elasticsearch.action.ShardOperationFailedException;
 import org.elasticsearch.action.admin.cluster.node.stats.NodeStats;
@@ -164,13 +163,8 @@ public class TransportDeleteByQueryActionTests extends ESSingleNodeTestCase {
         TestActionListener listener = new TestActionListener();
 
         final TransportDeleteByQueryAction.AsyncDeleteByQueryAction async = newAsyncAction(delete, listener);
-        awaitBusy(new Predicate<Object>() {
-            @Override
-            public boolean apply(Object input) {
         // Wait until the action timed out
-                return async.hasTimedOut();
+        awaitBusy(() -> async.hasTimedOut());
-            }
-        });
 
         async.executeScroll(searchResponse.getScrollId());
         waitForCompletion("scroll request returns zero documents on expired scroll id", listener);
@@ -419,12 +413,7 @@ public class TransportDeleteByQueryActionTests extends ESSingleNodeTestCase {
     private void waitForCompletion(String testName, final TestActionListener listener) {
         logger.info(" --> waiting for delete-by-query [{}] to complete", testName);
         try {
-            awaitBusy(new Predicate<Object>() {
+            awaitBusy(() -> listener.isTerminated());
-                @Override
-                public boolean apply(Object input) {
-                    return listener.isTerminated();
-                }
-            });
         } catch (InterruptedException e) {
             fail("exception when waiting for delete-by-query [" + testName + "] to complete: " + e.getMessage());
             logger.error("exception when waiting for delete-by-query [{}] to complete", e, testName);