Used pop instead of indexing and slicing for lookup_es_key
Used pop instead of indexing and slicing for lookup_es_key

jetyang2005/elastalert,ltagliamonte/elastalert,dvopsway/elastalert,Yelp/elastalert,jetyang2005/elastalert,rprabhat/elastalert,iamrudra/elastalert,jetyang2005/elastalert