Add number of shards statistic to PercolateContext instead of throwing exception.

Certain features like significant_terms aggregation rely on this statistic for sizing heuristics.

Closes #6037
Closes #6123

src/main/java/org/elasticsearch/action/admin/indices/cache/clear/TransportClearIndicesCacheAction.java

@@ -107,7 +107,7 @@ public class TransportClearIndicesCacheAction extends TransportBroadcastOperatio
     }
 
     @Override
-    protected ShardClearIndicesCacheRequest newShardRequest(ShardRouting shard, ClearIndicesCacheRequest request) {
+    protected ShardClearIndicesCacheRequest newShardRequest(int numShards, ShardRouting shard, ClearIndicesCacheRequest request) {
         return new ShardClearIndicesCacheRequest(shard.index(), shard.id(), request);
     }
 

src/main/java/org/elasticsearch/action/admin/indices/flush/TransportFlushAction.java

@@ -99,7 +99,7 @@ public class TransportFlushAction extends TransportBroadcastOperationAction<Flus
     }
 
     @Override
-    protected ShardFlushRequest newShardRequest(ShardRouting shard, FlushRequest request) {
+    protected ShardFlushRequest newShardRequest(int numShards, ShardRouting shard, FlushRequest request) {
         return new ShardFlushRequest(shard.index(), shard.id(), request);
     }
 

src/main/java/org/elasticsearch/action/admin/indices/optimize/TransportOptimizeAction.java

@@ -100,7 +100,7 @@ public class TransportOptimizeAction extends TransportBroadcastOperationAction<O
     }
 
     @Override
-    protected ShardOptimizeRequest newShardRequest(ShardRouting shard, OptimizeRequest request) {
+    protected ShardOptimizeRequest newShardRequest(int numShards, ShardRouting shard, OptimizeRequest request) {
         return new ShardOptimizeRequest(shard.index(), shard.id(), request);
     }
 

src/main/java/org/elasticsearch/action/admin/indices/recovery/TransportRecoveryAction.java

@@ -136,7 +136,7 @@ public class TransportRecoveryAction extends
     }
 
     @Override
-    protected ShardRecoveryRequest newShardRequest(ShardRouting shard, RecoveryRequest request) {
+    protected ShardRecoveryRequest newShardRequest(int numShards, ShardRouting shard, RecoveryRequest request) {
         return new ShardRecoveryRequest(shard.index(), shard.id(), request);
     }
 

src/main/java/org/elasticsearch/action/admin/indices/refresh/TransportRefreshAction.java

@@ -100,7 +100,7 @@ public class TransportRefreshAction extends TransportBroadcastOperationAction<Re
     }
 
     @Override
-    protected ShardRefreshRequest newShardRequest(ShardRouting shard, RefreshRequest request) {
+    protected ShardRefreshRequest newShardRequest(int numShards, ShardRouting shard, RefreshRequest request) {
         return new ShardRefreshRequest(shard.index(), shard.id(), request);
     }
 

src/main/java/org/elasticsearch/action/admin/indices/segments/TransportIndicesSegmentsAction.java

@@ -124,7 +124,7 @@ public class TransportIndicesSegmentsAction extends TransportBroadcastOperationA
     }
 
     @Override
-    protected IndexShardSegmentRequest newShardRequest(ShardRouting shard, IndicesSegmentsRequest request) {
+    protected IndexShardSegmentRequest newShardRequest(int numShards, ShardRouting shard, IndicesSegmentsRequest request) {
         return new IndexShardSegmentRequest(shard.index(), shard.id(), request);
     }
 

src/main/java/org/elasticsearch/action/admin/indices/stats/TransportIndicesStatsAction.java

@@ -125,7 +125,7 @@ public class TransportIndicesStatsAction extends TransportBroadcastOperationActi
     }
 
     @Override
-    protected IndexShardStatsRequest newShardRequest(ShardRouting shard, IndicesStatsRequest request) {
+    protected IndexShardStatsRequest newShardRequest(int numShards, ShardRouting shard, IndicesStatsRequest request) {
         return new IndexShardStatsRequest(shard.index(), shard.id(), request);
     }
 

src/main/java/org/elasticsearch/action/admin/indices/validate/query/TransportValidateQueryAction.java

@@ -108,7 +108,7 @@ public class TransportValidateQueryAction extends TransportBroadcastOperationAct
     }
 
     @Override
-    protected ShardValidateQueryRequest newShardRequest(ShardRouting shard, ValidateQueryRequest request) {
+    protected ShardValidateQueryRequest newShardRequest(int numShards, ShardRouting shard, ValidateQueryRequest request) {
         String[] filteringAliases = clusterService.state().metaData().filteringAliases(shard.index(), request.indices());
         return new ShardValidateQueryRequest(shard.index(), shard.id(), filteringAliases, request);
     }

src/main/java/org/elasticsearch/action/count/TransportCountAction.java

@@ -112,7 +112,7 @@ public class TransportCountAction extends TransportBroadcastOperationAction<Coun
     }
 
     @Override
-    protected ShardCountRequest newShardRequest(ShardRouting shard, CountRequest request) {
+    protected ShardCountRequest newShardRequest(int numShards, ShardRouting shard, CountRequest request) {
         String[] filteringAliases = clusterService.state().metaData().filteringAliases(shard.index(), request.indices());
         return new ShardCountRequest(shard.index(), shard.id(), filteringAliases, request);
     }

src/main/java/org/elasticsearch/action/percolate/PercolateShardRequest.java

@@ -19,6 +19,7 @@
 
 package org.elasticsearch.action.percolate;
 
+import org.elasticsearch.Version;
 import org.elasticsearch.action.support.broadcast.BroadcastShardOperationRequest;
 import org.elasticsearch.common.bytes.BytesReference;
 import org.elasticsearch.common.io.stream.StreamInput;
@@ -35,6 +36,7 @@ public class PercolateShardRequest extends BroadcastShardOperationRequest {
     private BytesReference source;
     private BytesReference docSource;
     private boolean onlyCount;
+    private int numberOfShards;
 
     public PercolateShardRequest() {
     }
@@ -43,12 +45,13 @@ public class PercolateShardRequest extends BroadcastShardOperationRequest {
         super(index, shardId);
     }
 
-    public PercolateShardRequest(String index, int shardId, PercolateRequest request) {
+    public PercolateShardRequest(String index, int shardId, int numberOfShards, PercolateRequest request) {
         super(index, shardId, request);
         this.documentType = request.documentType();
         this.source = request.source();
         this.docSource = request.docSource();
         this.onlyCount = request.onlyCount();
+        this.numberOfShards = numberOfShards;
     }
 
     public PercolateShardRequest(ShardId shardId, PercolateRequest request) {
@@ -91,6 +94,10 @@ public class PercolateShardRequest extends BroadcastShardOperationRequest {
         this.onlyCount = onlyCount;
     }
 
+    public int getNumberOfShards() {
+        return numberOfShards;
+    }
+
     @Override
     public void readFrom(StreamInput in) throws IOException {
         super.readFrom(in);
@@ -98,6 +105,9 @@ public class PercolateShardRequest extends BroadcastShardOperationRequest {
         source = in.readBytesReference();
         docSource = in.readBytesReference();
         onlyCount = in.readBoolean();
+        if (in.getVersion().onOrAfter(Version.V_1_2_0)) {
+            numberOfShards = in.readVInt();
+        }
     }
 
     @Override
@@ -107,6 +117,9 @@ public class PercolateShardRequest extends BroadcastShardOperationRequest {
         out.writeBytesReference(source);
         out.writeBytesReference(docSource);
         out.writeBoolean(onlyCount);
+        if (out.getVersion().onOrAfter(Version.V_1_2_0)) {
+            out.writeVInt(numberOfShards);
+        }
     }
 
 }

src/main/java/org/elasticsearch/action/percolate/TransportPercolateAction.java

@@ -173,8 +173,8 @@ public class TransportPercolateAction extends TransportBroadcastOperationAction<
     }
 
     @Override
-    protected PercolateShardRequest newShardRequest(ShardRouting shard, PercolateRequest request) {
-        return new PercolateShardRequest(shard.index(), shard.id(), request);
+    protected PercolateShardRequest newShardRequest(int numShards, ShardRouting shard, PercolateRequest request) {
+        return new PercolateShardRequest(shard.index(), shard.id(), numShards, request);
     }
 
     @Override

src/main/java/org/elasticsearch/action/suggest/TransportSuggestAction.java

@@ -93,7 +93,7 @@ public class TransportSuggestAction extends TransportBroadcastOperationAction<Su
     }
 
     @Override
-    protected ShardSuggestRequest newShardRequest(ShardRouting shard, SuggestRequest request) {
+    protected ShardSuggestRequest newShardRequest(int numShards, ShardRouting shard, SuggestRequest request) {
         return new ShardSuggestRequest(shard.index(), shard.id(), request);
     }
 

src/main/java/org/elasticsearch/action/support/broadcast/TransportBroadcastOperationAction.java

@@ -83,7 +83,7 @@ public abstract class TransportBroadcastOperationAction<Request extends Broadcas
 
     protected abstract ShardRequest newShardRequest();
 
-    protected abstract ShardRequest newShardRequest(ShardRouting shard, Request request);
+    protected abstract ShardRequest newShardRequest(int numShards, ShardRouting shard, Request request);
 
     protected abstract ShardResponse newShardResponse();
 
@@ -161,7 +161,7 @@ public abstract class TransportBroadcastOperationAction<Request extends Broadcas
                 onOperation(null, shardIt, shardIndex, new NoShardAvailableActionException(shardIt.shardId()));
             } else {
                 try {
-                    final ShardRequest shardRequest = newShardRequest(shard, request);
+                    final ShardRequest shardRequest = newShardRequest(shardIt.size(), shard, request);
                     if (shard.currentNodeId().equals(nodes.localNodeId())) {
                         threadPool.executor(executor).execute(new Runnable() {
                             @Override

src/main/java/org/elasticsearch/percolator/PercolateContext.java

@@ -93,6 +93,7 @@ public class PercolateContext extends SearchContext {
     private final BigArrays bigArrays;
     private final ScriptService scriptService;
     private final ConcurrentMap<HashedBytesRef, Query> percolateQueries;
+    private final int numberOfShards;
     private String[] types;
 
     private Engine.Searcher docSearcher;
@@ -127,6 +128,7 @@ public class PercolateContext extends SearchContext {
         this.engineSearcher = indexShard.acquireSearcher("percolate");
         this.searcher = new ContextIndexSearcher(this, engineSearcher);
         this.scriptService = scriptService;
+        this.numberOfShards = request.getNumberOfShards();
     }
 
     public IndexSearcher docSearcher() {
@@ -327,7 +329,7 @@ public class PercolateContext extends SearchContext {
 
     @Override
     public int numberOfShards() {
-        throw new UnsupportedOperationException();
+        return numberOfShards;
     }
 
     @Override

src/test/java/org/elasticsearch/percolator/PercolatorFacetsAndAggregationsTests.java

@@ -37,6 +37,7 @@ import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
 import static org.elasticsearch.index.query.QueryBuilders.matchAllQuery;
 import static org.elasticsearch.index.query.QueryBuilders.matchQuery;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertMatchCount;
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoFailures;
 import static org.hamcrest.Matchers.arrayWithSize;
 import static org.hamcrest.Matchers.equalTo;
 
@@ -122,4 +123,16 @@ public class PercolatorFacetsAndAggregationsTests extends ElasticsearchIntegrati
         }
     }
 
+    @Test
+    public void testSignificantAggs() throws Exception {
+        client().admin().indices().prepareCreate("test").execute().actionGet();
+        ensureGreen();
+        PercolateRequestBuilder percolateRequestBuilder = client().preparePercolate()
+                .setIndices("test").setDocumentType("type")
+                .setPercolateDoc(docBuilder().setDoc(jsonBuilder().startObject().field("field1", "value").endObject()))
+                .addAggregation(AggregationBuilders.significantTerms("a").field("field2"));
+        PercolateResponse response = percolateRequestBuilder.get();
+        assertNoFailures(response);
+    }
+
 }