Doc - Add info on how to update max shards

[AnaelMobilia]

Add information on how to fix "Elasticsearch error: RequestError(400, 'validation_exception', 'Validation Failed: 1: this action would add [1] shards, but this cluster currently has [1000]/[1000] maximum normal shards open;"

[codecov[bot]]

Codecov Report

Base: 59.23% // Head: 59.23% // No change to project coverage :thumbsup:

Coverage data is based on head (e034b7b) compared to base (49f9d75). Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #368   +/-   ##
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  Coverage   59.23%   59.23%           
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  Files          10       10           
  Lines        1332     1332           
=======================================
  Hits          789      789           
  Misses        543      543           

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[AndrewKvalheim]

Maybe add a note about monthly_indexes?

[AnaelMobilia]

@AndrewKvalheim Please feel free to open a pull request adding information about monthly_indexes :-)

Bests regards, Anael

[seanthegeek]

Thanks for all of the documentation improvements. Sorry I have neglected this project for so long.