Merge branch 'master' into initial-search-phase-async-on-next

* master:
  Timed runnable should delegate to abstract runnable
  Expose adaptive replica selection stats in /_nodes/stats API
  Remove dangerous `ByteBufStreamInput` methods (elastic#27076)
  Blacklist Gradle 4.2 and above
  Remove duplicated test (elastic#27091)
  Update numbers to reflect 4-byte UTF-8-encoded characters (elastic#27083)
  test: avoid generating duplicate multiple fields (elastic#27080)
  Reduce the default number of cached queries. (elastic#26949)
  removed unused import
  ingest: date processor should not fail if timestamp is specified as json number

Author: jasontedor

buildSrc/src/main/groovy/org/elasticsearch/gradle/BuildPlugin.groovy

@@ -123,12 +123,19 @@ class BuildPlugin implements Plugin<Project> {
             }
             println "  Random Testing Seed   : ${project.testSeed}"
 
-            // enforce gradle version
-            GradleVersion minGradle = GradleVersion.version('3.3')
-            if (GradleVersion.current() < minGradle) {
+            // enforce Gradle version
+            final GradleVersion currentGradleVersion = GradleVersion.current();
+
+            final GradleVersion minGradle = GradleVersion.version('3.3')
+            if (currentGradleVersion < minGradle) {
                 throw new GradleException("${minGradle} or above is required to build elasticsearch")
             }
 
+            final GradleVersion maxGradle = GradleVersion.version('4.2')
+            if (currentGradleVersion >= maxGradle) {
+                throw new GradleException("${maxGradle} or above is not compatible with the elasticsearch build")
+            }
+
             // enforce Java version
             if (javaVersionEnum < minimumJava) {
                 throw new GradleException("Java ${minimumJava} or above is required to build Elasticsearch")

core/src/main/java/org/elasticsearch/action/admin/cluster/node/stats/NodeStats.java

@@ -19,6 +19,7 @@
 
 package org.elasticsearch.action.admin.cluster.node.stats;
 
+import org.elasticsearch.Version;
 import org.elasticsearch.action.support.nodes.BaseNodeResponse;
 import org.elasticsearch.cluster.node.DiscoveryNode;
 import org.elasticsearch.common.Nullable;
@@ -36,6 +37,7 @@
 import org.elasticsearch.monitor.jvm.JvmStats;
 import org.elasticsearch.monitor.os.OsStats;
 import org.elasticsearch.monitor.process.ProcessStats;
+import org.elasticsearch.node.AdaptiveSelectionStats;
 import org.elasticsearch.script.ScriptStats;
 import org.elasticsearch.threadpool.ThreadPoolStats;
 import org.elasticsearch.transport.TransportStats;
@@ -86,6 +88,9 @@ public class NodeStats extends BaseNodeResponse implements ToXContentFragment {
     @Nullable
     private IngestStats ingestStats;
 
+    @Nullable
+    private AdaptiveSelectionStats adaptiveSelectionStats;
+
     NodeStats() {
     }
 
@@ -95,7 +100,8 @@ public NodeStats(DiscoveryNode node, long timestamp, @Nullable NodeIndicesStats
                      @Nullable AllCircuitBreakerStats breaker,
                      @Nullable ScriptStats scriptStats,
                      @Nullable DiscoveryStats discoveryStats,
-                     @Nullable IngestStats ingestStats) {
+                     @Nullable IngestStats ingestStats,
+                     @Nullable AdaptiveSelectionStats adaptiveSelectionStats) {
         super(node);
         this.timestamp = timestamp;
         this.indices = indices;
@@ -110,6 +116,7 @@ public NodeStats(DiscoveryNode node, long timestamp, @Nullable NodeIndicesStats
         this.scriptStats = scriptStats;
         this.discoveryStats = discoveryStats;
         this.ingestStats = ingestStats;
+        this.adaptiveSelectionStats = adaptiveSelectionStats;
     }
 
     public long getTimestamp() {
@@ -199,6 +206,11 @@ public IngestStats getIngestStats() {
         return ingestStats;
     }
 
+    @Nullable
+    public AdaptiveSelectionStats getAdaptiveSelectionStats() {
+        return adaptiveSelectionStats;
+    }
+
     public static NodeStats readNodeStats(StreamInput in) throws IOException {
         NodeStats nodeInfo = new NodeStats();
         nodeInfo.readFrom(in);
@@ -223,6 +235,11 @@ public void readFrom(StreamInput in) throws IOException {
         scriptStats = in.readOptionalWriteable(ScriptStats::new);
         discoveryStats = in.readOptionalWriteable(DiscoveryStats::new);
         ingestStats = in.readOptionalWriteable(IngestStats::new);
+        if (in.getVersion().onOrAfter(Version.V_6_1_0)) {
+            adaptiveSelectionStats = in.readOptionalWriteable(AdaptiveSelectionStats::new);
+        } else {
+            adaptiveSelectionStats = null;
+        }
     }
 
     @Override
@@ -246,6 +263,9 @@ public void writeTo(StreamOutput out) throws IOException {
         out.writeOptionalWriteable(scriptStats);
         out.writeOptionalWriteable(discoveryStats);
         out.writeOptionalWriteable(ingestStats);
+        if (out.getVersion().onOrAfter(Version.V_6_1_0)) {
+            out.writeOptionalWriteable(adaptiveSelectionStats);
+        }
     }
 
     @Override
@@ -306,6 +326,9 @@ public XContentBuilder toXContent(XContentBuilder builder, Params params) throws
         if (getIngestStats() != null) {
             getIngestStats().toXContent(builder, params);
         }
+        if (getAdaptiveSelectionStats() != null) {
+            getAdaptiveSelectionStats().toXContent(builder, params);
+        }
         return builder;
     }
 }

core/src/main/java/org/elasticsearch/action/admin/cluster/node/stats/NodesStatsRequest.java

@@ -19,6 +19,7 @@
 
 package org.elasticsearch.action.admin.cluster.node.stats;
 
+import org.elasticsearch.Version;
 import org.elasticsearch.action.admin.indices.stats.CommonStatsFlags;
 import org.elasticsearch.action.support.nodes.BaseNodesRequest;
 import org.elasticsearch.common.io.stream.StreamInput;
@@ -43,6 +44,7 @@ public class NodesStatsRequest extends BaseNodesRequest<NodesStatsRequest> {
     private boolean script;
     private boolean discovery;
     private boolean ingest;
+    private boolean adaptiveSelection;
 
     public NodesStatsRequest() {
     }
@@ -71,6 +73,7 @@ public NodesStatsRequest all() {
         this.script = true;
         this.discovery = true;
         this.ingest = true;
+        this.adaptiveSelection = true;
         return this;
     }
 
@@ -90,6 +93,7 @@ public NodesStatsRequest clear() {
         this.script = false;
         this.discovery = false;
         this.ingest = false;
+        this.adaptiveSelection = false;
         return this;
     }
 
@@ -265,6 +269,18 @@ public NodesStatsRequest ingest(boolean ingest) {
         return this;
     }
 
+    public boolean adaptiveSelection() {
+        return adaptiveSelection;
+    }
+
+    /**
+     * Should adaptiveSelection statistics be returned.
+     */
+    public NodesStatsRequest adaptiveSelection(boolean adaptiveSelection) {
+        this.adaptiveSelection = adaptiveSelection;
+        return this;
+    }
+
     @Override
     public void readFrom(StreamInput in) throws IOException {
         super.readFrom(in);
@@ -280,6 +296,11 @@ public void readFrom(StreamInput in) throws IOException {
         script = in.readBoolean();
         discovery = in.readBoolean();
         ingest = in.readBoolean();
+        if (in.getVersion().onOrAfter(Version.V_6_1_0)) {
+            adaptiveSelection = in.readBoolean();
+        } else {
+            adaptiveSelection = false;
+        }
     }
 
     @Override
@@ -297,5 +318,8 @@ public void writeTo(StreamOutput out) throws IOException {
         out.writeBoolean(script);
         out.writeBoolean(discovery);
         out.writeBoolean(ingest);
+        if (out.getVersion().onOrAfter(Version.V_6_1_0)) {
+            out.writeBoolean(adaptiveSelection);
+        }
     }
 }

core/src/main/java/org/elasticsearch/action/admin/cluster/node/stats/TransportNodesStatsAction.java

@@ -73,7 +73,7 @@ protected NodeStats nodeOperation(NodeStatsRequest nodeStatsRequest) {
         NodesStatsRequest request = nodeStatsRequest.request;
         return nodeService.stats(request.indices(), request.os(), request.process(), request.jvm(), request.threadPool(),
                 request.fs(), request.transport(), request.http(), request.breaker(), request.script(), request.discovery(),
-                request.ingest());
+                request.ingest(), request.adaptiveSelection());
     }
 
     public static class NodeStatsRequest extends BaseNodeRequest {

core/src/main/java/org/elasticsearch/action/admin/cluster/stats/TransportClusterStatsAction.java

@@ -92,7 +92,8 @@ protected ClusterStatsNodeResponse newNodeResponse() {
     @Override
     protected ClusterStatsNodeResponse nodeOperation(ClusterStatsNodeRequest nodeRequest) {
         NodeInfo nodeInfo = nodeService.info(true, true, false, true, false, true, false, true, false, false);
-        NodeStats nodeStats = nodeService.stats(CommonStatsFlags.NONE, true, true, true, false, true, false, false, false, false, false, false);
+        NodeStats nodeStats = nodeService.stats(CommonStatsFlags.NONE,
+                true, true, true, false, true, false, false, false, false, false, false, false);
         List<ShardStats> shardsStats = new ArrayList<>();
         for (IndexService indexService : indicesService) {
             for (IndexShard indexShard : indexService) {

core/src/main/java/org/elasticsearch/action/search/SearchTransportService.java

@@ -60,6 +60,7 @@
 
 import java.io.IOException;
 import java.io.UncheckedIOException;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.function.BiFunction;
@@ -94,6 +95,10 @@ public SearchTransportService(Settings settings, TransportService transportServi
         this.responseWrapper = responseWrapper;
     }
 
+    public Map<String, Long> getClientConnections() {
+        return Collections.unmodifiableMap(clientConnections);
+    }
+
     public void sendFreeContext(Transport.Connection connection, final long contextId, OriginalIndices originalIndices) {
         transportService.sendRequest(connection, FREE_CONTEXT_ACTION_NAME, new SearchFreeContextRequest(originalIndices, contextId),
             TransportRequestOptions.EMPTY, new ActionListenerResponseHandler<>(new ActionListener<SearchFreeContextResponse>() {

core/src/main/java/org/elasticsearch/common/util/concurrent/TimedRunnable.java

@@ -23,19 +23,19 @@
  * A class used to wrap a {@code Runnable} that allows capturing the time of the task since creation
  * through execution as well as only execution time.
  */
-class TimedRunnable implements Runnable {
+class TimedRunnable extends AbstractRunnable {
     private final Runnable original;
     private final long creationTimeNanos;
     private long startTimeNanos;
     private long finishTimeNanos = -1;
 
-    TimedRunnable(Runnable original) {
+    TimedRunnable(final Runnable original) {
         this.original = original;
         this.creationTimeNanos = System.nanoTime();
     }
 
     @Override
-    public void run() {
+    public void doRun() {
         try {
             startTimeNanos = System.nanoTime();
             original.run();
@@ -44,6 +44,32 @@ public void run() {
         }
     }
 
+    @Override
+    public void onRejection(final Exception e) {
+        if (original instanceof AbstractRunnable) {
+            ((AbstractRunnable) original).onRejection(e);
+        }
+    }
+
+    @Override
+    public void onAfter() {
+        if (original instanceof AbstractRunnable) {
+            ((AbstractRunnable) original).onAfter();
+        }
+    }
+
+    @Override
+    public void onFailure(final Exception e) {
+        if (original instanceof AbstractRunnable) {
+            ((AbstractRunnable) original).onFailure(e);
+        }
+    }
+
+    @Override
+    public boolean isForceExecution() {
+        return original instanceof AbstractRunnable && ((AbstractRunnable) original).isForceExecution();
+    }
+
     /**
      * Return the time since this task was created until it finished running.
      * If the task is still running or has not yet been run, returns -1.
@@ -67,4 +93,5 @@ long getTotalExecutionNanos() {
         }
         return finishTimeNanos - startTimeNanos;
     }
+
 }

core/src/main/java/org/elasticsearch/indices/IndicesQueryCache.java

@@ -53,7 +53,7 @@ public class IndicesQueryCache extends AbstractComponent implements QueryCache,
     public static final Setting<ByteSizeValue> INDICES_CACHE_QUERY_SIZE_SETTING = 
             Setting.memorySizeSetting("indices.queries.cache.size", "10%", Property.NodeScope);
     public static final Setting<Integer> INDICES_CACHE_QUERY_COUNT_SETTING = 
-            Setting.intSetting("indices.queries.cache.count", 10000, 1, Property.NodeScope);
+            Setting.intSetting("indices.queries.cache.count", 1000, 1, Property.NodeScope);
     // enables caching on all segments instead of only the larger ones, for testing only
     public static final Setting<Boolean> INDICES_QUERIES_CACHE_ALL_SEGMENTS_SETTING = 
             Setting.boolSetting("indices.queries.cache.all_segments", false, Property.NodeScope);