Elasticsearch docs: Minor copyedits and add links to issues
Elasticsearch docs: Minor copyedits and add links to issues

stoplightio/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq