Merge branch 'master' into lazy-seq-no-bit-sets

* master:
  Remove checkpoint tracker bit sets setting
  Fix stable BWC branch detection logic
  Fix logic detecting unreleased versions
  Enhances exists queries to reduce need for `_field_names` (elastic#26930)
  Added new terms_set query
  Set request body to required to reflect the code base (elastic#27188)
  Update Docker docs for 6.0.0-rc2 (elastic#27166)
  Add version 6.0.0
  Docs: restore now fails if it encounters incompatible settings (elastic#26933)
  Convert index blocks to cluster block exceptions (elastic#27050)
  [DOCS] Link remote info API in Cross Cluster Search docs page
  Fix Laplace scorer to multiply by alpha (and not add) (elastic#27125)
  [DOCS] Clarify migrate guide and search request validation
  Raise IllegalArgumentException if query validation failed (elastic#26811)
  prevent duplicate fields when mixing parent and root nested includes (elastic#27072)
  TopHitsAggregator must propagate calls to `setScorer`. (elastic#27138)

Author: jasontedor

core/src/main/java/org/elasticsearch/Version.java

@@ -118,6 +118,9 @@ public class Version implements Comparable<Version> {
     public static final int V_6_0_0_rc2_ID = 6000052;
     public static final Version V_6_0_0_rc2 =
         new Version(V_6_0_0_rc2_ID, org.apache.lucene.util.Version.LUCENE_7_0_1);
+    public static final int V_6_0_0_ID = 6000099;
+    public static final Version V_6_0_0 =
+        new Version(V_6_0_0_ID, org.apache.lucene.util.Version.LUCENE_7_0_1);
     public static final int V_6_1_0_ID = 6010099;
     public static final Version V_6_1_0 =
         new Version(V_6_1_0_ID, org.apache.lucene.util.Version.LUCENE_7_1_0);
@@ -143,6 +146,8 @@ public static Version fromId(int id) {
                 return V_7_0_0_alpha1;
             case V_6_1_0_ID:
                 return V_6_1_0;
+            case V_6_0_0_ID:
+                return V_6_0_0;
             case V_6_0_0_rc2_ID:
                 return V_6_0_0_rc2;
             case V_6_0_0_beta2_ID:

core/src/main/java/org/elasticsearch/action/admin/indices/template/delete/TransportDeleteIndexTemplateAction.java

@@ -62,7 +62,7 @@ protected DeleteIndexTemplateResponse newResponse() {
 
     @Override
     protected ClusterBlockException checkBlock(DeleteIndexTemplateRequest request, ClusterState state) {
-        return state.blocks().indexBlockedException(ClusterBlockLevel.METADATA_WRITE, "");
+        return state.blocks().globalBlockedException(ClusterBlockLevel.METADATA_WRITE);
     }
 
     @Override

core/src/main/java/org/elasticsearch/action/admin/indices/template/put/TransportPutIndexTemplateAction.java

@@ -66,7 +66,7 @@ protected PutIndexTemplateResponse newResponse() {
 
     @Override
     protected ClusterBlockException checkBlock(PutIndexTemplateRequest request, ClusterState state) {
-        return state.blocks().indexBlockedException(ClusterBlockLevel.METADATA_WRITE, "");
+        return state.blocks().globalBlockedException(ClusterBlockLevel.METADATA_WRITE);
     }
 
     @Override

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

@@ -120,7 +120,6 @@ public final class IndexScopedSettings extends AbstractScopedSettings {
         IndexSettings.QUERY_STRING_LENIENT_SETTING,
         IndexSettings.ALLOW_UNMAPPED,
         IndexSettings.INDEX_CHECK_ON_STARTUP,
-        LocalCheckpointTracker.SETTINGS_BIT_ARRAYS_SIZE,
         IndexSettings.MAX_REFRESH_LISTENERS_PER_SHARD,
         IndexSettings.MAX_SLICES_PER_SCROLL,
         ShardsLimitAllocationDecider.INDEX_TOTAL_SHARDS_PER_NODE_SETTING,

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

@@ -20,10 +20,14 @@
 package org.elasticsearch.index.mapper;
 
 import com.carrotsearch.hppc.ObjectArrayList;
+
 import org.apache.lucene.document.Field;
 import org.apache.lucene.index.IndexOptions;
 import org.apache.lucene.index.IndexableField;
+import org.apache.lucene.index.Term;
+import org.apache.lucene.search.DocValuesFieldExistsQuery;
 import org.apache.lucene.search.Query;
+import org.apache.lucene.search.TermQuery;
 import org.apache.lucene.store.ByteArrayDataOutput;
 import org.apache.lucene.util.BytesRef;
 import org.elasticsearch.ElasticsearchException;
@@ -126,6 +130,15 @@ public IndexFieldData.Builder fielddataBuilder(String fullyQualifiedIndexName) {
             return new BytesBinaryDVIndexFieldData.Builder();
         }
 
+        @Override
+        public Query existsQuery(QueryShardContext context) {
+            if (hasDocValues()) {
+                return new DocValuesFieldExistsQuery(name());
+            } else {
+                return new TermQuery(new Term(FieldNamesFieldMapper.NAME, name()));
+            }
+        }
+
         @Override
         public Query termQuery(Object value, QueryShardContext context) {
             throw new QueryShardException(context, "Binary fields do not support searching");
@@ -165,6 +178,11 @@ protected void parseCreateField(ParseContext context, List<IndexableField> field
             } else {
                 field.add(value);
             }
+        } else {
+            // Only add an entry to the field names field if the field is stored
+            // but has no doc values so exists query will work on a field with
+            // no doc values
+            createFieldNamesField(context, fields);
         }
 
     }

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

@@ -23,7 +23,10 @@
 import org.apache.lucene.document.SortedNumericDocValuesField;
 import org.apache.lucene.index.IndexOptions;
 import org.apache.lucene.index.IndexableField;
+import org.apache.lucene.index.Term;
+import org.apache.lucene.search.DocValuesFieldExistsQuery;
 import org.apache.lucene.search.Query;
+import org.apache.lucene.search.TermQuery;
 import org.apache.lucene.search.TermRangeQuery;
 import org.apache.lucene.util.BytesRef;
 import org.elasticsearch.Version;
@@ -136,6 +139,15 @@ public String typeName() {
             return CONTENT_TYPE;
         }
 
+        @Override
+        public Query existsQuery(QueryShardContext context) {
+            if (hasDocValues()) {
+                return new DocValuesFieldExistsQuery(name());
+            } else {
+                return new TermQuery(new Term(FieldNamesFieldMapper.NAME, name()));
+            }
+        }
+
         @Override
         public Boolean nullValue() {
             return (Boolean)super.nullValue();
@@ -253,6 +265,8 @@ protected void parseCreateField(ParseContext context, List<IndexableField> field
         }
         if (fieldType().hasDocValues()) {
             fields.add(new SortedNumericDocValuesField(fieldType().name(), value ? 1 : 0));
+        } else {
+            createFieldNamesField(context, fields);
         }
     }
 

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

@@ -21,6 +21,8 @@
 import org.apache.lucene.codecs.PostingsFormat;
 import org.apache.lucene.index.IndexableField;
 import org.apache.lucene.index.Term;
+import org.apache.lucene.search.Query;
+import org.apache.lucene.search.TermQuery;
 import org.apache.lucene.search.suggest.document.Completion50PostingsFormat;
 import org.apache.lucene.search.suggest.document.CompletionAnalyzer;
 import org.apache.lucene.search.suggest.document.CompletionQuery;
@@ -40,11 +42,13 @@
 import org.elasticsearch.common.xcontent.XContentParser.Token;
 import org.elasticsearch.index.analysis.AnalyzerScope;
 import org.elasticsearch.index.analysis.NamedAnalyzer;
+import org.elasticsearch.index.query.QueryShardContext;
 import org.elasticsearch.search.suggest.completion.CompletionSuggester;
 import org.elasticsearch.search.suggest.completion.context.ContextMapping;
 import org.elasticsearch.search.suggest.completion.context.ContextMappings;
 
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -257,6 +261,11 @@ public static synchronized PostingsFormat postingsFormat() {
             return postingsFormat;
         }
 
+        @Override
+        public Query existsQuery(QueryShardContext context) {
+            return new TermQuery(new Term(FieldNamesFieldMapper.NAME, name()));
+        }
+
         /**
          * Completion prefix query
          */
@@ -456,6 +465,11 @@ public Mapper parse(ParseContext context) throws IOException {
                 context.doc().add(new SuggestField(fieldType().name(), input, metaData.weight));
             }
         }
+        List<IndexableField> fields = new ArrayList<>(1);
+        createFieldNamesField(context, fields);
+        for (IndexableField field : fields) {
+            context.doc().add(field);
+        }
         multiFields.parse(this, context);
         return null;
     }

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

@@ -26,9 +26,12 @@
 import org.apache.lucene.index.IndexReader;
 import org.apache.lucene.index.IndexableField;
 import org.apache.lucene.index.PointValues;
+import org.apache.lucene.index.Term;
 import org.apache.lucene.search.BoostQuery;
+import org.apache.lucene.search.DocValuesFieldExistsQuery;
 import org.apache.lucene.search.IndexOrDocValuesQuery;
 import org.apache.lucene.search.Query;
+import org.apache.lucene.search.TermQuery;
 import org.apache.lucene.util.BytesRef;
 import org.elasticsearch.Version;
 import org.elasticsearch.common.Explicit;
@@ -245,6 +248,15 @@ long parse(String value) {
             return dateTimeFormatter().parser().parseMillis(value);
         }
 
+        @Override
+        public Query existsQuery(QueryShardContext context) {
+            if (hasDocValues()) {
+                return new DocValuesFieldExistsQuery(name());
+            } else {
+                return new TermQuery(new Term(FieldNamesFieldMapper.NAME, name()));
+            }
+        }
+
         @Override
         public Query termQuery(Object value, @Nullable QueryShardContext context) {
             Query query = rangeQuery(value, value, true, true, ShapeRelation.INTERSECTS, null, null, context);
@@ -451,6 +463,8 @@ protected void parseCreateField(ParseContext context, List<IndexableField> field
         }
         if (fieldType().hasDocValues()) {
             fields.add(new SortedNumericDocValuesField(fieldType().name(), timestamp));
+        } else if (fieldType().stored() || fieldType().indexOptions() != IndexOptions.NONE) {
+            createFieldNamesField(context, fields);
         }
         if (fieldType().stored()) {
             fields.add(new StoredField(fieldType().name(), timestamp));

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

@@ -22,6 +22,7 @@
 import com.carrotsearch.hppc.cursors.ObjectCursor;
 import com.carrotsearch.hppc.cursors.ObjectObjectCursor;
 
+import org.apache.lucene.document.Field;
 import org.apache.lucene.document.FieldType;
 import org.apache.lucene.index.IndexOptions;
 import org.apache.lucene.index.IndexableField;
@@ -33,6 +34,7 @@
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.index.analysis.NamedAnalyzer;
+import org.elasticsearch.index.mapper.FieldNamesFieldMapper.FieldNamesFieldType;
 import org.elasticsearch.index.similarity.SimilarityProvider;
 import org.elasticsearch.index.similarity.SimilarityService;
 
@@ -285,6 +287,16 @@ public Mapper parse(ParseContext context) throws IOException {
      */
     protected abstract void parseCreateField(ParseContext context, List<IndexableField> fields) throws IOException;
 
+    protected void createFieldNamesField(ParseContext context, List<IndexableField> fields) {
+        FieldNamesFieldType fieldNamesFieldType = (FieldNamesFieldMapper.FieldNamesFieldType) context.docMapper()
+                .metadataMapper(FieldNamesFieldMapper.class).fieldType();
+        if (fieldNamesFieldType != null && fieldNamesFieldType.isEnabled()) {
+            for (String fieldName : FieldNamesFieldMapper.extractFieldNames(fieldType().name())) {
+                fields.add(new Field(FieldNamesFieldMapper.NAME, fieldName, fieldNamesFieldType));
+            }
+        }
+    }
+
     @Override
     public Iterator<Mapper> iterator() {
         return multiFields.iterator();

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

@@ -23,6 +23,10 @@
 import org.apache.lucene.index.IndexOptions;
 import org.apache.lucene.index.IndexableField;
 import org.apache.lucene.search.Query;
+import org.elasticsearch.Version;
+import org.elasticsearch.cluster.metadata.IndexMetaData;
+import org.elasticsearch.common.logging.DeprecationLogger;
+import org.elasticsearch.common.logging.ESLoggerFactory;
 import org.elasticsearch.common.lucene.Lucene;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.xcontent.XContentBuilder;
@@ -44,6 +48,9 @@
  */
 public class FieldNamesFieldMapper extends MetadataFieldMapper {
 
+    private static final DeprecationLogger DEPRECATION_LOGGER = new DeprecationLogger(
+            ESLoggerFactory.getLogger(FieldNamesFieldMapper.class));
+
     public static final String NAME = "_field_names";
 
     public static final String CONTENT_TYPE = "_field_names";
@@ -178,11 +185,18 @@ public boolean isEnabled() {
             return enabled;
         }
 
+        @Override
+        public Query existsQuery(QueryShardContext context) {
+            throw new UnsupportedOperationException("Cannot run exists query on _field_names");
+        }
+
         @Override
         public Query termQuery(Object value, QueryShardContext context) {
             if (isEnabled() == false) {
                 throw new IllegalStateException("Cannot run [exists] queries if the [_field_names] field is disabled");
             }
+            DEPRECATION_LOGGER.deprecated(
+                    "terms query on the _field_names field is deprecated and will be removed, use exists query instead");
             return super.termQuery(value, context);
         }
     }
@@ -206,12 +220,14 @@ public void preParse(ParseContext context) throws IOException {
 
     @Override
     public void postParse(ParseContext context) throws IOException {
-        super.parse(context);
+        if (context.indexSettings().getAsVersion(IndexMetaData.SETTING_VERSION_CREATED, Version.CURRENT).before(Version.V_6_1_0)) {
+            super.parse(context);
+        }
     }
 
     @Override
     public Mapper parse(ParseContext context) throws IOException {
-        // we parse in post parse
+        // Adding values to the _field_names field is handled by the mappers for each field type
         return null;
     }