[jira] [Created] (FLINK-7697) Add metrics for Elasticsearch Sink

[Shang Yuanchun (Jira)]

Hai Zhou UTC+8 created FLINK-7697:
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             Summary: Add metrics for Elasticsearch Sink
                 Key: FLINK-7697
                 URL: https://issues.apache.org/jira/browse/FLINK-7697
             Project: Flink
          Issue Type: Wish
          Components: ElasticSearch Connector
            Reporter: Hai Zhou UTC+8
            Priority: Critical


We should add metrics  to track  events write to ElasticasearchSink.
eg.
* number of successful bulk sends
* number of documents inserted
* number of documents updated
* number of documents version conflicts




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