Add parsing method for Top Hits aggregation (#24717)

Related to #23331 

1 files changed, 63 insertions, 0 deletions

diff --git a/core/src/main/java/org/elasticsearch/search/aggregations/metrics/tophits/ParsedTopHits.java b/core/src/main/java/org/elasticsearch/search/aggregations/metrics/tophits/ParsedTopHits.java
new file mode 100644
index 0000000000..362423abca
--- /dev/null
+++ b/core/src/main/java/org/elasticsearch/search/aggregations/metrics/tophits/ParsedTopHits.java
@@ -0,0 +1,63 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.search.aggregations.metrics.tophits;
+
+import org.elasticsearch.common.ParseField;
+import org.elasticsearch.common.xcontent.ObjectParser;
+import org.elasticsearch.common.xcontent.XContentBuilder;
+import org.elasticsearch.common.xcontent.XContentParser;
+import org.elasticsearch.search.SearchHits;
+import org.elasticsearch.search.aggregations.ParsedAggregation;
+
+import java.io.IOException;
+
+public class ParsedTopHits extends ParsedAggregation implements TopHits {
+
+    private SearchHits searchHits;
+
+    @Override
+    public String getType() {
+        return TopHitsAggregationBuilder.NAME;
+    }
+
+    @Override
+    public SearchHits getHits() {
+        return searchHits;
+    }
+
+    @Override
+    protected XContentBuilder doXContentBody(XContentBuilder builder, Params params) throws IOException {
+        return searchHits.toXContent(builder, params);
+    }
+
+    private static ObjectParser<ParsedTopHits, Void> PARSER =
+            new ObjectParser<>(ParsedTopHits.class.getSimpleName(), true, ParsedTopHits::new);
+    static {
+        declareAggregationFields(PARSER);
+        PARSER.declareObject((topHit, searchHits) -> topHit.searchHits = searchHits, (parser, context) -> SearchHits.fromXContent(parser),
+                new ParseField(SearchHits.Fields.HITS));
+    }
+
+    public static ParsedTopHits fromXContent(XContentParser parser, String name) throws IOException {
+        ParsedTopHits aggregation = PARSER.parse(parser, null);
+        aggregation.setName(name);
+        return aggregation;
+    }
+}