[DOC] Added info about performing the index operation in background (Resque, Sidekiq, etc)
[DOC] Added info about performing the index operation in background (Resque, Sidekiq, etc)

dbose/retire,brijeshgpt7/retire,rubydubee/retire,1776/tire,Telmate/tire,elbuo8/retire,fabn/retire,HenleyChiu/tire,zaharpecherin/retire,karmi/retire,ChapterMedia/tire,doximity/tire,mavenlink/retire,tklee/tire_shiphawk,iamrahulroy/retire