The `elasticsearch` sink `compression` option now defaults to `none`

To optimize throughput we originally defaulted the elasticsearch sink compression option to gzip. It is our philosophy that Vector's defaults should optimize performance and throughput, but not at the expense of causing errors. Unfortunately, AWS-hosted Elasticsearch does not support compression, and therefore we've made this feature opt-in.

Upgrade Guide

Upgrading is easy. Add the following if you want to enabled Gzip compression:

 [sinks.es]
   type = "elasticsearch"
+  compression = "gzip"