apache / apache/beam

In stream mode, ElasticsearchIO transform becomes unavailable

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bug elasticsearch gcp io java P3
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Description

If you use the ElasticSearchIO transform for a workflow in stream mode, and if something happens temporarily between the RestClient and the server, any future calls will result in a 
> java.io.IOException: Connection reset by peer
> As there is not reconnection system ou keepalive enable, the client seems not able to reconnect and the workflow cannot work anymore.

Imported from Jira [BEAM-12577](https://issues.apache.org/jira/browse/BEAM-12577). Original Jira may contain additional context.
Reported by: jgallon.

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