Github user dbrinegar commented on the issue:
https://github.com/apache/flink/pull/4188
The check fail seems to be an elasticsearch timeout, otherwise is all green:
```
Tests run: 9, Failures: 0, Errors: 4, Skipped: 0, Time elapsed: 66.507 sec
<<< FAILURE! - in
org.apache.flink.streaming.connectors.elasticsearch.ElasticsearchSinkITCase
testDeprecatedIndexRequestBuilderVariant(org.apache.flink.streaming.connectors.elasticsearch.ElasticsearchSinkITCase)
Time elapsed: 60.187 sec <<< ERROR!
```
```
Caused by: java.lang.RuntimeException: Elasticsearch client is not
connected to any Elasticsearch nodes!
at
org.apache.flink.streaming.connectors.elasticsearch.Elasticsearch1ApiCallBridge.createClient(Elasticsearch1ApiCallBridge.java:105)
```
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