use inferred name; update error msg; update tests

Author: dvehar

modules/parent-join/src/main/java/org/elasticsearch/join/query/HasChildQueryBuilder.java

@@ -460,13 +460,13 @@ protected QueryBuilder doRewrite(QueryRewriteContext queryShardContext) throws I
     @Override
     protected void extractInnerHitBuilders(Map<String, InnerHitContextBuilder> innerHits) {
         if (innerHitBuilder != null) {
-            if (innerHits.containsKey(innerHitBuilder.getName())) {
-                throw new IllegalArgumentException("innerHits already contains an entry for key [" + innerHitBuilder.getName() + "]");
+            String name = innerHitBuilder.getName() != null ? innerHitBuilder.getName() : type;
+            if (innerHits.containsKey(name)) {
+                throw new IllegalArgumentException("[inner_hits] already contains an entry for key [" + name + "]");
             }
 
             Map<String, InnerHitContextBuilder> children = new HashMap<>();
             InnerHitContextBuilder.extractInnerHits(query, children);
-            String name = innerHitBuilder.getName() != null ? innerHitBuilder.getName() : type;
             InnerHitContextBuilder innerHitContextBuilder =
                 new ParentChildInnerHitContextBuilder(type, true, query, innerHitBuilder, children);
             innerHits.put(name, innerHitContextBuilder);

modules/parent-join/src/main/java/org/elasticsearch/join/query/HasParentQueryBuilder.java

@@ -285,13 +285,13 @@ protected QueryBuilder doRewrite(QueryRewriteContext queryShardContext) throws I
     @Override
     protected void extractInnerHitBuilders(Map<String, InnerHitContextBuilder> innerHits) {
         if (innerHitBuilder != null) {
-            if (innerHits.containsKey(innerHitBuilder.getName())) {
-                throw new IllegalArgumentException("innerHits already contains an entry for key [" + innerHitBuilder.getName() + "]");
+            String name = innerHitBuilder.getName() != null ? innerHitBuilder.getName() : type;
+            if (innerHits.containsKey(name)) {
+                throw new IllegalArgumentException("[inner_hits] already contains an entry for key [" + name + "]");
             }
 
             Map<String, InnerHitContextBuilder> children = new HashMap<>();
             InnerHitContextBuilder.extractInnerHits(query, children);
-            String name = innerHitBuilder.getName() != null ? innerHitBuilder.getName() : type;
             InnerHitContextBuilder innerHitContextBuilder =
                 new ParentChildInnerHitContextBuilder(type, false, query, innerHitBuilder, children);
             innerHits.put(name, innerHitContextBuilder);

server/src/main/java/org/elasticsearch/index/query/NestedQueryBuilder.java

@@ -318,13 +318,13 @@ protected QueryBuilder doRewrite(QueryRewriteContext queryRewriteContext) throws
     @Override
     public void extractInnerHitBuilders(Map<String, InnerHitContextBuilder> innerHits) {
         if (innerHitBuilder != null) {
-            if (innerHits.containsKey(innerHitBuilder.getName())) {
-                throw new IllegalArgumentException("innerHits already contains an entry for key [" + innerHitBuilder.getName() + "]");
+            String name = innerHitBuilder.getName() != null ? innerHitBuilder.getName() : path;
+            if (innerHits.containsKey(name)) {
+                throw new IllegalArgumentException("[inner_hits] already contains an entry for key [" + name + "]");
             }
 
             Map<String, InnerHitContextBuilder> children = new HashMap<>();
             InnerHitContextBuilder.extractInnerHits(query, children);
-            String name = innerHitBuilder.getName() != null ? innerHitBuilder.getName() : path;
             InnerHitContextBuilder innerHitContextBuilder = new NestedInnerHitContextBuilder(path, query, innerHitBuilder, children);
             innerHits.put(name, innerHitContextBuilder);
         }

server/src/test/java/org/elasticsearch/search/aggregations/bucket/NestedIT.java

@@ -680,7 +680,7 @@ public void testFilterAggInsideNestedAgg() throws Exception {
         assertThat(numStringParams.getDocCount(), equalTo(0L));
     }
 
-    public void testExtractInnerHitBuildersWithDuplicateName() throws Exception {
+    public void testExtractInnerHitBuildersWithDuplicateHitName() throws Exception {
         assertAcked(
             prepareCreate("idxduplicatehitnames")
                 .setSettings(Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 1).put(SETTING_NUMBER_OF_REPLICAS, 0))
@@ -698,23 +698,27 @@ public void testExtractInnerHitBuildersWithDuplicateName() throws Exception {
         assertFailures(
             searchRequestBuilder,
             RestStatus.BAD_REQUEST,
-            containsString("innerHits already contains an entry for key [ih1]"));
+            containsString("[inner_hits] already contains an entry for key [ih1]"));
     }
 
-    public void testExtractInnerHitBuildersWithNullName() throws Exception {
+    public void testExtractInnerHitBuildersWithDuplicatePath() throws Exception {
         assertAcked(
             prepareCreate("idxnullhitnames")
                 .setSettings(Settings.builder().put(SETTING_NUMBER_OF_SHARDS, 1).put(SETTING_NUMBER_OF_REPLICAS, 0))
                 .addMapping("product", "categories", "type=keyword", "name", "type=text", "property", "type=nested")
         );
         ensureGreen("idxnullhitnames");
 
-        SearchResponse response = client().prepareSearch("idxnullhitnames")
+        SearchRequestBuilder searchRequestBuilder = client()
+            .prepareSearch("idxnullhitnames")
             .setQuery(boolQuery()
                 .should(nestedQuery("property", termQuery("property.id", 1D), ScoreMode.None).innerHit(new InnerHitBuilder()))
                 .should(nestedQuery("property", termQuery("property.id", 1D), ScoreMode.None).innerHit(new InnerHitBuilder()))
-                .should(nestedQuery("property", termQuery("property.id", 1D), ScoreMode.None).innerHit(new InnerHitBuilder()))
-            ).get();
-        assertNoFailures(response);
+                .should(nestedQuery("property", termQuery("property.id", 1D), ScoreMode.None).innerHit(new InnerHitBuilder())));
+
+        assertFailures(
+            searchRequestBuilder,
+            RestStatus.BAD_REQUEST,
+            containsString("[inner_hits] already contains an entry for key [property]"));
     }
 }