tzulitai commented on a change in pull request #7576: 
[FLINK-11046][elasticsearch] Fix ElasticSearch6Connector thread blocked when 
index failed with retry
URL: https://github.com/apache/flink/pull/7576#discussion_r255293509
 
 

 ##########
 File path: 
flink-connectors/flink-connector-elasticsearch-base/src/main/java/org/apache/flink/streaming/connectors/elasticsearch/ElasticsearchApiCallBridge.java
 ##########
 @@ -93,6 +93,18 @@ default RequestIndexer createBulkProcessorIndexer(
                        numPendingRequestsRef);
        }
 
+       /**
+        * Creates a {@link RequestIndexer} that is able to work with {@link 
BulkProcessor} binary compatible.
+        */
+       default ElasticsearchFailureHandlerIndexer createFailureHandlerIndexer(
+                       boolean flushOnCheckpoint,
+                       AtomicLong numPendingRequestsRef) {
 
 Review comment:
   Perhaps the responsibility of keeping track of the number of in-flight 
requests should be tracked by a `BulkProcessorWrapper`.

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