Merge branch '6.x' into ccr-6.x

* 6.x:
  Fixed byte buffer leak in Netty4 request handler
  Avoid uid creation in ParsedDocument (#27241)
  Upgrade to Lucene 7.1 (#27225)
  Add additional explanations around discovery.zen.ping_timeout (#27231)
  Fix compile error
  Remove unused searcher parameter in SearchService#createContext (#27227)
  Fix sequence number assertions in BWC tests
  Move IndexShard#getWritingBytes() under InternalEngine (#27209)
  Adjust bwc version for exists query tests

buildSrc/version.properties

@@ -1,6 +1,6 @@
 # When updating elasticsearch, please update 'rest' version in core/src/main/resources/org/elasticsearch/bootstrap/test-framework.policy
 elasticsearch     = 6.1.0
-lucene            = 7.1.0-snapshot-f33ed4ba12a
+lucene            = 7.1.0
 
 # optional dependencies
 spatial4j         = 0.6

core/licenses/lucene-analyzers-common-7.1.0.jar.sha1

@@ -0,0 +1 @@
+a508bf6b580471ee568dab7d2acfedfa5aadce70

core/licenses/lucene-backward-codecs-7.1.0.jar.sha1

@@ -0,0 +1 @@
+804a7ce82bba3d085733486bfde4846ecb77ce01

core/licenses/lucene-core-7.1.0.jar.sha1

@@ -0,0 +1 @@
+dd291b7ebf4845483895724d2562214dc7f40049

core/licenses/lucene-grouping-7.1.0.jar.sha1

@@ -0,0 +1 @@
+0732d16c16421fca058a2a07ca4081ec7696365b

core/licenses/lucene-highlighter-7.1.0.jar.sha1

@@ -0,0 +1 @@
+596550daabae765ad685112e0fe7c4f0fdfccb3f

core/licenses/lucene-join-7.1.0.jar.sha1

@@ -0,0 +1 @@
+5f26dd64c195258a81175772ef7fe105e7d60a26

core/licenses/lucene-memory-7.1.0.jar.sha1

@@ -0,0 +1 @@
+3ef64c58d0c09ca40d848efa96b585b7476271f2

core/licenses/lucene-misc-7.1.0.jar.sha1

@@ -0,0 +1 @@
+1496ee5fa62206ee5ddf51042a340d6a9ee3b5de

core/licenses/lucene-queries-7.1.0.jar.sha1

@@ -0,0 +1 @@
+1554920ab207a3245fa408d022a5c90ad3a1fea3

core/licenses/lucene-queryparser-7.1.0.jar.sha1

@@ -0,0 +1 @@
+5767c15c5ee97926829fd8a4337e434fa95f3c08

core/licenses/lucene-sandbox-7.1.0.jar.sha1

@@ -0,0 +1 @@
+691f7b9ac05f3ad2ac7e80733ef70247904bd3ae

core/licenses/lucene-spatial-7.1.0.jar.sha1

@@ -0,0 +1 @@
+6c64c04d802badb800516a8a574cb993929c3805

core/licenses/lucene-spatial-extras-7.1.0.jar.sha1

@@ -0,0 +1 @@
+3f1bc1aada8f06b176b782da24b9d7ad9641c41a

core/licenses/lucene-spatial3d-7.1.0.jar.sha1

@@ -0,0 +1 @@
+8ded650aed23efb775f17be496e3e3870214e23b

core/licenses/lucene-suggest-7.1.0.jar.sha1

@@ -0,0 +1 @@
+8d0ed1589ebdccf34e888c6efc0134a13a238c85

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

@@ -155,7 +155,7 @@ protected ShardValidateQueryResponse shardOperation(ShardValidateQueryRequest re
         String error = null;
         ShardSearchLocalRequest shardSearchLocalRequest = new ShardSearchLocalRequest(request.shardId(), request.types(),
             request.nowInMillis(), request.filteringAliases());
-        SearchContext searchContext = searchService.createSearchContext(shardSearchLocalRequest, SearchService.NO_TIMEOUT, null);
+        SearchContext searchContext = searchService.createSearchContext(shardSearchLocalRequest, SearchService.NO_TIMEOUT);
         try {
             ParsedQuery parsedQuery = searchContext.getQueryShardContext().toQuery(request.query());
             searchContext.parsedQuery(parsedQuery);

core/src/main/java/org/elasticsearch/action/explain/TransportExplainAction.java

@@ -90,7 +90,7 @@ protected void resolveRequest(ClusterState state, InternalRequest request) {
     protected ExplainResponse shardOperation(ExplainRequest request, ShardId shardId) throws IOException {
         ShardSearchLocalRequest shardSearchLocalRequest = new ShardSearchLocalRequest(shardId,
             new String[]{request.type()}, request.nowInMillis, request.filteringAlias());
-        SearchContext context = searchService.createSearchContext(shardSearchLocalRequest, SearchService.NO_TIMEOUT, null);
+        SearchContext context = searchService.createSearchContext(shardSearchLocalRequest, SearchService.NO_TIMEOUT);
         Engine.GetResult result = null;
         try {
             Term uidTerm = context.mapperService().createUidTerm(request.type(), request.id());

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

@@ -187,6 +187,9 @@ public MergeStats getMergeStats() {
     /** returns the history uuid for the engine */
     public abstract String getHistoryUUID();
 
+    /** Returns how many bytes we are currently moving from heap to disk */
+    public abstract long getWritingBytes();
+
     /**
      * A throttling class that can be activated, causing the
      * {@code acquireThrottle} method to block on a lock when throttling
@@ -707,7 +710,7 @@ protected void writerSegmentStats(SegmentsStats stats) {
     }
 
     /** How much heap is used that would be freed by a refresh.  Note that this may throw {@link AlreadyClosedException}. */
-    public abstract  long getIndexBufferRAMBytesUsed();
+    public abstract long getIndexBufferRAMBytesUsed();
 
     protected Segment[] getSegmentInfo(SegmentInfos lastCommittedSegmentInfos, boolean verbose) {
         ensureOpen();

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

@@ -140,6 +140,12 @@ public class InternalEngine extends Engine {
     private final AtomicLong maxUnsafeAutoIdTimestamp = new AtomicLong(-1);
     private final CounterMetric numVersionLookups = new CounterMetric();
     private final CounterMetric numIndexVersionsLookups = new CounterMetric();
+    /**
+     * How many bytes we are currently moving to disk, via either IndexWriter.flush or refresh.  IndexingMemoryController polls this
+     * across all shards to decide if throttling is necessary because moving bytes to disk is falling behind vs incoming documents
+     * being indexed/deleted.
+     */
+    private final AtomicLong writingBytes = new AtomicLong();
 
     @Nullable
     private final String historyUUID;
@@ -422,6 +428,12 @@ public String getHistoryUUID() {
         return historyUUID;
     }
 
+    /** Returns how many bytes we are currently moving from indexing buffer to segments on disk */
+    @Override
+    public long getWritingBytes() {
+        return writingBytes.get();
+    }
+
     /**
      * Reads the current stored translog ID from the IW commit data. If the id is not found, recommits the current
      * translog id into lucene and returns null.
@@ -1230,21 +1242,26 @@ public void refresh(String source) throws EngineException {
     }
 
     final void refresh(String source, SearcherScope scope) throws EngineException {
+        long bytes = 0;
         // we obtain a read lock here, since we don't want a flush to happen while we are refreshing
         // since it flushes the index as well (though, in terms of concurrency, we are allowed to do it)
         try (ReleasableLock lock = readLock.acquire()) {
             ensureOpen();
+            bytes = indexWriter.ramBytesUsed();
             switch (scope) {
                 case EXTERNAL:
                     // even though we maintain 2 managers we really do the heavy-lifting only once.
                     // the second refresh will only do the extra work we have to do for warming caches etc.
+                    writingBytes.addAndGet(bytes);
                     externalSearcherManager.maybeRefreshBlocking();
                     // the break here is intentional we never refresh both internal / external together
                     break;
                 case INTERNAL:
+                    final long versionMapBytes = versionMap.ramBytesUsedForRefresh();
+                    bytes += versionMapBytes;
+                    writingBytes.addAndGet(bytes);
                     internalSearcherManager.maybeRefreshBlocking();
                     break;
-
                 default:
                     throw new IllegalArgumentException("unknown scope: " + scope);
             }
@@ -1258,6 +1275,8 @@ final void refresh(String source, SearcherScope scope) throws EngineException {
                 e.addSuppressed(inner);
             }
             throw new RefreshFailedEngineException(shardId, e);
+        }  finally {
+            writingBytes.addAndGet(-bytes);
         }
 
         // TODO: maybe we should just put a scheduled job in threadPool?
@@ -1271,24 +1290,7 @@ final void refresh(String source, SearcherScope scope) throws EngineException {
     public void writeIndexingBuffer() throws EngineException {
         // we obtain a read lock here, since we don't want a flush to happen while we are writing
         // since it flushes the index as well (though, in terms of concurrency, we are allowed to do it)
-        try (ReleasableLock lock = readLock.acquire()) {
-            ensureOpen();
-            final long versionMapBytes = versionMap.ramBytesUsedForRefresh();
-            final long indexingBufferBytes = indexWriter.ramBytesUsed();
-            logger.debug("use refresh to write indexing buffer (heap size=[{}]), to also clear version map (heap size=[{}])",
-                    new ByteSizeValue(indexingBufferBytes), new ByteSizeValue(versionMapBytes));
-            refresh("write indexing buffer", SearcherScope.INTERNAL);
-        } catch (AlreadyClosedException e) {
-            failOnTragicEvent(e);
-            throw e;
-        } catch (Exception e) {
-            try {
-                failEngine("writeIndexingBuffer failed", e);
-            } catch (Exception inner) {
-                e.addSuppressed(inner);
-            }
-            throw new RefreshFailedEngineException(shardId, e);
-        }
+        refresh("write indexing buffer", SearcherScope.INTERNAL);
     }
 
     @Override

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

@@ -20,7 +20,6 @@
 package org.elasticsearch.index.mapper;
 
 import org.apache.lucene.document.Field;
-import org.apache.lucene.util.BytesRef;
 import org.elasticsearch.common.bytes.BytesReference;
 import org.elasticsearch.common.xcontent.XContentType;
 import org.elasticsearch.index.mapper.ParseContext.Document;
@@ -35,7 +34,6 @@ public class ParsedDocument {
     private final Field version;
 
     private final String id, type;
-    private final BytesRef uid;
     private final SeqNoFieldMapper.SequenceIDFields seqID;
 
     private final String routing;
@@ -62,7 +60,6 @@ public ParsedDocument(Field version,
         this.seqID = seqID;
         this.id = id;
         this.type = type;
-        this.uid = Uid.createUidAsBytes(type, id);
         this.routing = routing;
         this.documents = documents;
         this.source = source;
@@ -140,9 +137,7 @@ public void addDynamicMappingsUpdate(Mapping update) {
 
     @Override
     public String toString() {
-        StringBuilder sb = new StringBuilder();
-        sb.append("Document ").append("uid[").append(uid).append("] doc [").append(documents).append("]");
-        return sb.toString();
+        return "Document uid[" + Uid.createUidAsBytes(type, id) + "] doc [" + documents + ']';
     }
 
 }

core/src/main/java/org/elasticsearch/index/shard/IndexShard.java

@@ -182,12 +182,6 @@ public class IndexShard extends AbstractIndexShardComponent implements IndicesCl
     private final QueryCachingPolicy cachingPolicy;
     private final Supplier<Sort> indexSortSupplier;
 
-    /**
-     * How many bytes we are currently moving to disk, via either IndexWriter.flush or refresh.  IndexingMemoryController polls this
-     * across all shards to decide if throttling is necessary because moving bytes to disk is falling behind vs incoming documents
-     * being indexed/deleted.
-     */
-    private final AtomicLong writingBytes = new AtomicLong();
     private final SearchOperationListener searchOperationListener;
 
     protected volatile ShardRouting shardRouting;
@@ -323,12 +317,6 @@ public Store store() {
     public Sort getIndexSort() {
         return indexSortSupplier.get();
     }
-    /**
-     * returns true if this shard supports indexing (i.e., write) operations.
-     */
-    public boolean canIndex() {
-        return true;
-    }
 
     public ShardGetService getService() {
         return this.getService;
@@ -839,34 +827,21 @@ public Engine.GetResult get(Engine.Get get) {
      */
     public void refresh(String source) {
         verifyNotClosed();
-
-        if (canIndex()) {
-            long bytes = getEngine().getIndexBufferRAMBytesUsed();
-            writingBytes.addAndGet(bytes);
-            try {
-                if (logger.isTraceEnabled()) {
-                    logger.trace("refresh with source [{}] indexBufferRAMBytesUsed [{}]", source, new ByteSizeValue(bytes));
-                }
-                getEngine().refresh(source);
-            } finally {
-                if (logger.isTraceEnabled()) {
-                    logger.trace("remove [{}] writing bytes for shard [{}]", new ByteSizeValue(bytes), shardId());
-                }
-                writingBytes.addAndGet(-bytes);
-            }
-        } else {
-            if (logger.isTraceEnabled()) {
-                logger.trace("refresh with source [{}]", source);
-            }
-            getEngine().refresh(source);
+        if (logger.isTraceEnabled()) {
+            logger.trace("refresh with source [{}]", source);
         }
+        getEngine().refresh(source);
     }
 
     /**
      * Returns how many bytes we are currently moving from heap to disk
      */
     public long getWritingBytes() {
-        return writingBytes.get();
+        Engine engine = getEngineOrNull();
+        if (engine == null) {
+            return 0;
+        }
+        return engine.getWritingBytes();
     }
 
     public RefreshStats refreshStats() {
@@ -1677,24 +1652,9 @@ private void handleRefreshException(Exception e) {
      * Called when our shard is using too much heap and should move buffered indexed/deleted documents to disk.
      */
     public void writeIndexingBuffer() {
-        if (canIndex() == false) {
-            throw new UnsupportedOperationException();
-        }
         try {
             Engine engine = getEngine();
-            long bytes = engine.getIndexBufferRAMBytesUsed();
-
-            // NOTE: this can be an overestimate by up to 20%, if engine uses IW.flush not refresh, because version map
-            // memory is low enough, but this is fine because after the writes finish, IMC will poll again and see that
-            // there's still up to the 20% being used and continue writing if necessary:
-            logger.debug("add [{}] writing bytes for shard [{}]", new ByteSizeValue(bytes), shardId());
-            writingBytes.addAndGet(bytes);
-            try {
-                engine.writeIndexingBuffer();
-            } finally {
-                writingBytes.addAndGet(-bytes);
-                logger.debug("remove [{}] writing bytes for shard [{}]", new ByteSizeValue(bytes), shardId());
-            }
+            engine.writeIndexingBuffer();
         } catch (Exception e) {
             handleRefreshException(e);
         }

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

@@ -152,8 +152,7 @@ ByteSizeValue indexingBufferSize() {
     protected List<IndexShard> availableShards() {
         List<IndexShard> availableShards = new ArrayList<>();
         for (IndexShard shard : indexShards) {
-            // shadow replica doesn't have an indexing buffer
-            if (shard.canIndex() && CAN_WRITE_INDEX_BUFFER_STATES.contains(shard.state())) {
+            if (CAN_WRITE_INDEX_BUFFER_STATES.contains(shard.state())) {
                 availableShards.add(shard);
             }
         }