fix IndexResponse#toString to print out shards info (#20562)

IndexResponse#toString method outputs an error caused by the shards object needing to be wrapped into another object. It is fixed by calling a different variant of Strings.toString(XContent) which accepts a second boolean argument that makes sure that a new object is created before outputting ShardInfo. I didn't change ShardInfo#toString directly as whether it needs a new object or not very much depends on where it is printed out. IndexResponse seemed a specific case as the rest of the info were not json, hence the shards object was the first one, but it is usually not the case.

core/src/main/java/org/elasticsearch/action/index/IndexResponse.java

@@ -20,6 +20,7 @@
 package org.elasticsearch.action.index;
 
 import org.elasticsearch.action.DocWriteResponse;
+import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.xcontent.XContentBuilder;
 import org.elasticsearch.index.shard.ShardId;
 import org.elasticsearch.rest.RestStatus;
@@ -56,7 +57,7 @@ public class IndexResponse extends DocWriteResponse {
         builder.append(",id=").append(getId());
         builder.append(",version=").append(getVersion());
         builder.append(",result=").append(getResult().getLowercase());
-        builder.append(",shards=").append(getShardInfo());
+        builder.append(",shards=").append(Strings.toString(getShardInfo(), true));
         return builder.append("]").toString();
     }
 

core/src/test/java/org/elasticsearch/action/index/IndexRequestTests.java

@@ -20,8 +20,11 @@ package org.elasticsearch.action.index;
 
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.support.ActiveShardCount;
+import org.elasticsearch.action.support.replication.ReplicationResponse;
 import org.elasticsearch.common.unit.TimeValue;
 import org.elasticsearch.index.VersionType;
+import org.elasticsearch.index.shard.ShardId;
+import org.elasticsearch.rest.RestStatus;
 import org.elasticsearch.test.ESTestCase;
 
 import java.util.Arrays;
@@ -150,4 +153,34 @@ public class IndexRequestTests extends ESTestCase {
         request.process(null, true, "index");
         assertEquals(IndexRequest.UNSET_AUTO_GENERATED_TIMESTAMP, request.getAutoGeneratedTimestamp());
     }
+
+    public void testIndexResponse() {
+        ShardId shardId = new ShardId(randomAsciiOfLengthBetween(3, 10), randomAsciiOfLengthBetween(3, 10), randomIntBetween(0, 1000));
+        String type = randomAsciiOfLengthBetween(3, 10);
+        String id = randomAsciiOfLengthBetween(3, 10);
+        long version = randomLong();
+        boolean created = randomBoolean();
+        IndexResponse indexResponse = new IndexResponse(shardId, type, id, version, created);
+        int total = randomIntBetween(1, 10);
+        int successful = randomIntBetween(1, 10);
+        ReplicationResponse.ShardInfo shardInfo = new ReplicationResponse.ShardInfo(total, successful);
+        indexResponse.setShardInfo(shardInfo);
+        boolean forcedRefresh = false;
+        if (randomBoolean()) {
+            forcedRefresh = randomBoolean();
+            indexResponse.setForcedRefresh(forcedRefresh);
+        }
+        assertEquals(type, indexResponse.getType());
+        assertEquals(id, indexResponse.getId());
+        assertEquals(version, indexResponse.getVersion());
+        assertEquals(shardId, indexResponse.getShardId());
+        assertEquals(created ? RestStatus.CREATED : RestStatus.OK, indexResponse.status());
+        assertEquals(total, indexResponse.getShardInfo().getTotal());
+        assertEquals(successful, indexResponse.getShardInfo().getSuccessful());
+        assertEquals(forcedRefresh, indexResponse.forcedRefresh());
+        assertEquals("IndexResponse[index=" + shardId.getIndexName() + ",type=" + type + ",id="+ id +
+                ",version=" + version + ",result=" + (created ? "created" : "updated") +
+                ",shards={\"_shards\":{\"total\":" + total + ",\"successful\":" + successful + ",\"failed\":0}}]",
+                indexResponse.toString());
+    }
 }