[exporter/elasticsearch] support both go-elasticsearch v7 & v8 #37187
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Description
Use go-elasticsearch/v8 (which is being actively developed) by default, and add a
version
configuration setting that can be set to7
to use go-elasticsearch/v7.(Note that I think it's worth having a discussion about whether this is worthwhile, since v8 will support 7.17.x, and older version of Elasticsearch are EOL. See #32454 (comment))
Link to tracking issue
Fixes #32454
Testing
TODO
Documentation
Updated README with a new section on Elasticsearch version compatibility.