Break down ES guide into two separate guides for small and big instances

Valery Sizov requested to merge elasticsearch_doc_improve into master

What does this MR do?

Improves ES documentation

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?


Edited by Valery Sizov

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