Remove unhelpful BulkResponse#status() method (#99865)

BulkResponse#status() always returns 200 OK, and consumers wishing to check
if there were any errors during the bulk update need to consult the hasFailures()
method. This is confusing and error-prone, as can be seen in a couple of tests that
are checking status() to know whether or not to continue.

This commit removes status() entirely from BulkResponse.

Related to #99824

server/src/main/java/org/elasticsearch/action/bulk/BulkResponse.java

@@ -12,9 +12,8 @@
 import org.elasticsearch.common.collect.Iterators;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
-import org.elasticsearch.common.xcontent.StatusToXContentObject;
 import org.elasticsearch.core.TimeValue;
-import org.elasticsearch.rest.RestStatus;
+import org.elasticsearch.xcontent.ToXContentObject;
 import org.elasticsearch.xcontent.XContentBuilder;
 import org.elasticsearch.xcontent.XContentParser;
 
@@ -32,7 +31,7 @@
  * bulk requests. Each item holds the index/type/id is operated on, and if it failed or not (with the
  * failure message).
  */
-public class BulkResponse extends ActionResponse implements Iterable<BulkItemResponse>, StatusToXContentObject {
+public class BulkResponse extends ActionResponse implements Iterable<BulkItemResponse>, ToXContentObject {
 
     private static final String ITEMS = "items";
     private static final String ERRORS = "errors";
@@ -134,11 +133,6 @@ public void writeTo(StreamOutput out) throws IOException {
         out.writeZLong(ingestTookInMillis);
     }
 
-    @Override
-    public RestStatus status() {
-        return RestStatus.OK;
-    }
-
     @Override
     public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
         builder.startObject();

server/src/main/java/org/elasticsearch/rest/action/document/RestBulkAction.java

@@ -19,7 +19,7 @@
 import org.elasticsearch.rest.RestRequest;
 import org.elasticsearch.rest.Scope;
 import org.elasticsearch.rest.ServerlessScope;
-import org.elasticsearch.rest.action.RestStatusToXContentListener;
+import org.elasticsearch.rest.action.RestToXContentListener;
 import org.elasticsearch.search.fetch.subphase.FetchSourceContext;
 
 import java.io.IOException;
@@ -93,7 +93,7 @@ public RestChannelConsumer prepareRequest(final RestRequest request, final NodeC
             request.getRestApiVersion()
         );
 
-        return channel -> client.bulk(bulkRequest, new RestStatusToXContentListener<>(channel));
+        return channel -> client.bulk(bulkRequest, new RestToXContentListener<>(channel));
     }
 
     @Override

x-pack/plugin/downsample/src/main/java/org/elasticsearch/xpack/downsample/DownsampleShardIndexer.java

@@ -39,6 +39,7 @@
 import org.elasticsearch.index.query.SearchExecutionContext;
 import org.elasticsearch.index.shard.IndexShard;
 import org.elasticsearch.index.shard.ShardId;
+import org.elasticsearch.rest.RestStatus;
 import org.elasticsearch.search.DocValueFormat;
 import org.elasticsearch.search.aggregations.AggregationExecutionContext;
 import org.elasticsearch.search.aggregations.BucketCollector;
@@ -280,7 +281,7 @@ public void afterBulk(long executionId, BulkRequest request, BulkResponse respon
                         bulkIngestTookMillis,
                         bulkTookMillis,
                         response.hasFailures(),
-                        response.status().getStatus()
+                        RestStatus.OK.getStatus()
                     )
                 );
                 task.updateBulkInfo(bulkIngestTookMillis, bulkTookMillis);

x-pack/plugin/ml/qa/native-multi-node-tests/src/javaRestTest/java/org/elasticsearch/xpack/ml/integration/DeleteExpiredDataIT.java

@@ -20,7 +20,6 @@
 import org.elasticsearch.common.Strings;
 import org.elasticsearch.core.TimeValue;
 import org.elasticsearch.index.query.QueryBuilders;
-import org.elasticsearch.rest.RestStatus;
 import org.elasticsearch.search.SearchHit;
 import org.elasticsearch.xcontent.ToXContent;
 import org.elasticsearch.xcontent.XContentBuilder;
@@ -290,7 +289,7 @@ private void testExpiredDeletion(Float customThrottle, int numUnusedState) throw
         }
 
         // Before we call the delete-expired-data action we need to make sure the unused state docs were indexed
-        assertThat(indexUnusedStateDocsResponse.get().status(), equalTo(RestStatus.OK));
+        assertFalse(indexUnusedStateDocsResponse.get().hasFailures());
 
         // Now call the action under test
         assertThat(deleteExpiredData(customThrottle).isDeleted(), is(true));

x-pack/plugin/searchable-snapshots/src/internalClusterTest/java/org/elasticsearch/xpack/searchablesnapshots/cache/full/SearchableSnapshotsPrewarmingIntegTests.java

@@ -139,7 +139,6 @@ public void testConcurrentPrewarming() throws Exception {
                     bulkRequest.add(client().prepareIndex(indexName).setSource("foo", randomBoolean() ? "bar" : "baz"));
                 }
                 final BulkResponse bulkResponse = bulkRequest.get();
-                assertThat(bulkResponse.status(), is(RestStatus.OK));
                 assertThat(bulkResponse.hasFailures(), is(false));
             }
             docsPerIndex.put(indexName, nbDocs);