Update docs to note ES go indexer included in Omnibus
Currently the official ElasticSearch Integration documentation states that the Elasticsearch Go indexer must be installed in all situations.
This is no longer the case as Omnibus includes the Go indexer and all dependencies since version 11.8, as confirmed in the ElasticSearch Deep Dive.
Docs should be updated to note:
- Omnibus includes the new Go indexer and all dependencies since 11.8
- building and installing the Go indexer is only required for source (and older) installations
Edited by Greg Myers