Don't lookup version for auto generated id and create

When a create document is executed, and its an auto generated id (based on UUID), we know that the document will not exists in the index, so there is no need to try and lookup the version from the index.
For many cases, like logging, where ids are auto generated, this can improve the indexing performance, specifically for lightweight documents where analysis is not a big part of the execution.

src/main/java/org/elasticsearch/action/bulk/TransportShardBulkAction.java

@@ -424,7 +424,8 @@ public class TransportShardBulkAction extends TransportShardReplicationOperation
                 op = index;
                 created = index.created();
             } else {
-                Engine.Create create = indexShard.prepareCreate(sourceToParse).version(indexRequest.version()).versionType(indexRequest.versionType()).origin(Engine.Operation.Origin.PRIMARY);
+                Engine.Create create = indexShard.prepareCreate(sourceToParse).version(indexRequest.version()).versionType(indexRequest.versionType()).origin(Engine.Operation.Origin.PRIMARY)
+                        .autoGeneratedId(indexRequest.autoGeneratedId());
                 if (create.parsedDoc().mappingsModified()) {
                     mappingsToUpdate = Tuple.tuple(indexRequest.index(), indexRequest.type());
                 }
@@ -573,6 +574,7 @@ public class TransportShardBulkAction extends TransportShardReplicationOperation
                     } else {
                         Engine.Create create = indexShard.prepareCreate(sourceToParse)
                                 .version(indexRequest.version()).versionType(indexRequest.versionType())
+                                .autoGeneratedId(indexRequest.autoGeneratedId())
                                 .origin(Engine.Operation.Origin.REPLICA);
                         indexShard.create(create);
                     }

src/main/java/org/elasticsearch/action/index/IndexRequest.java

@@ -20,10 +20,7 @@
 package org.elasticsearch.action.index;
 
 import com.google.common.base.Charsets;
-import org.elasticsearch.ElasticsearchException;
-import org.elasticsearch.ElasticsearchGenerationException;
-import org.elasticsearch.ElasticsearchIllegalArgumentException;
-import org.elasticsearch.ElasticsearchParseException;
+import org.elasticsearch.*;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.RoutingMissingException;
 import org.elasticsearch.action.support.replication.ShardReplicationOperationRequest;
@@ -128,6 +125,7 @@ public class IndexRequest extends ShardReplicationOperationRequest<IndexRequest>
     private boolean sourceUnsafe;
 
     private OpType opType = OpType.INDEX;
+    private boolean autoGeneratedId = false;
 
     private boolean refresh = false;
     private long version = Versions.MATCH_ANY;
@@ -541,6 +539,13 @@ public class IndexRequest extends ShardReplicationOperationRequest<IndexRequest>
         return this.versionType;
     }
 
+    /**
+     * Has the id been auto generated?
+     */
+    public boolean autoGeneratedId() {
+        return this.autoGeneratedId;
+    }
+
     public void process(MetaData metaData, String aliasOrIndex, @Nullable MappingMetaData mappingMd, boolean allowIdGeneration) throws ElasticsearchException {
         // resolve the routing if needed
         routing(metaData.resolveIndexRouting(routing, aliasOrIndex));
@@ -597,6 +602,7 @@ public class IndexRequest extends ShardReplicationOperationRequest<IndexRequest>
                 id(Strings.randomBase64UUID());
                 // since we generate the id, change it to CREATE
                 opType(IndexRequest.OpType.CREATE);
+                autoGeneratedId = true;
             }
         }
 
@@ -622,6 +628,9 @@ public class IndexRequest extends ShardReplicationOperationRequest<IndexRequest>
         refresh = in.readBoolean();
         version = in.readLong();
         versionType = VersionType.fromValue(in.readByte());
+        if (in.getVersion().onOrAfter(Version.V_1_2_0)) {
+            autoGeneratedId = in.readBoolean();
+        }
     }
 
     @Override
@@ -638,6 +647,9 @@ public class IndexRequest extends ShardReplicationOperationRequest<IndexRequest>
         out.writeBoolean(refresh);
         out.writeLong(version);
         out.writeByte(versionType.getValue());
+        if (out.getVersion().onOrAfter(Version.V_1_2_0)) {
+            out.writeBoolean(autoGeneratedId);
+        }
     }
 
     @Override

src/main/java/org/elasticsearch/action/index/TransportIndexAction.java

@@ -215,6 +215,7 @@ public class TransportIndexAction extends TransportShardReplicationOperationActi
             Engine.Create create = indexShard.prepareCreate(sourceToParse)
                     .version(request.version())
                     .versionType(request.versionType())
+                    .autoGeneratedId(request.autoGeneratedId())
                     .origin(Engine.Operation.Origin.PRIMARY);
             if (create.parsedDoc().mappingsModified()) {
                 updateMappingOnMaster(request, indexMetaData);
@@ -256,6 +257,7 @@ public class TransportIndexAction extends TransportShardReplicationOperationActi
         } else {
             Engine.Create create = indexShard.prepareCreate(sourceToParse)
                     .version(request.version()).versionType(request.versionType())
+                    .autoGeneratedId(request.autoGeneratedId())
                     .origin(Engine.Operation.Origin.REPLICA);
             indexShard.create(create);
         }

src/main/java/org/elasticsearch/index/engine/Engine.java

@@ -388,6 +388,7 @@ public interface Engine extends IndexShardComponent, CloseableComponent {
         private final Term uid;
         private final ParsedDocument doc;
         private long version = Versions.MATCH_ANY;
+        private boolean autoGeneratedId = false;
         private VersionType versionType = VersionType.INTERNAL;
         private Origin origin = Origin.PRIMARY;
 
@@ -468,6 +469,15 @@ public interface Engine extends IndexShardComponent, CloseableComponent {
             return this;
         }
 
+        public Create autoGeneratedId(boolean autoGeneratedId) {
+            this.autoGeneratedId = autoGeneratedId;
+            return this;
+        }
+
+        public boolean autoGeneratedId() {
+            return this.autoGeneratedId;
+        }
+
         public String parent() {
             return this.doc.parent();
         }

src/main/java/org/elasticsearch/index/engine/internal/InternalEngine.java

@@ -406,7 +406,12 @@ public class InternalEngine extends AbstractIndexShardComponent implements Engin
         synchronized (dirtyLock(create.uid())) {
             HashedBytesRef versionKey = versionKey(create.uid());
             final long currentVersion;
-            VersionValue versionValue = versionMap.get(versionKey);
+            final VersionValue versionValue;
+            if (create.autoGeneratedId()) {
+                currentVersion = Versions.NOT_FOUND;
+                versionValue = null;
+            } else {
+                versionValue = versionMap.get(versionKey);
                 if (versionValue == null) {
                     currentVersion = loadCurrentVersionFromIndex(create.uid());
                 } else {
@@ -416,6 +421,7 @@ public class InternalEngine extends AbstractIndexShardComponent implements Engin
                         currentVersion = versionValue.version();
                     }
                 }
+            }
 
             // same logic as index
             long updatedVersion;

src/test/java/org/elasticsearch/benchmark/stress/SingleThreadBulkStress.java

@@ -50,6 +50,7 @@ public class SingleThreadBulkStress {
 
         int shardsCount = Integer.parseInt(System.getProperty("es.shards", "1"));
         int replicaCount = Integer.parseInt(System.getProperty("es.replica", "1"));
+        boolean autoGenerateId = true;
 
         Settings settings = settingsBuilder()
                 .put("index.refresh_interval", "1s")
@@ -94,7 +95,7 @@ public class SingleThreadBulkStress {
             BulkRequestBuilder request = client1.prepareBulk();
             for (int j = 0; j < BATCH; j++) {
                 counter++;
-                request.add(Requests.indexRequest("test").type("type1").id(Integer.toString(counter)).source(source(Integer.toString(counter), "test" + counter)));
+                request.add(Requests.indexRequest("test").type("type1").id(autoGenerateId ? null : Integer.toString(counter)).source(source(Integer.toString(counter), "test" + counter)));
             }
             BulkResponse response = request.execute().actionGet();
             if (response.hasFailures()) {