Hello, My index is called "index=main_ruolo", the fields in it are: user_id, Function, Role The lookup table with which I need to make a merge is called "merge.csv", the fields are: Function_L, Role_L In the lookup table "merge.csv", the Function_L - Role_L is the correct one The purpose is to create a list of all user_id in "index=main_ruolo" where Function and Role do not match Function_L and Role_L Ex wrong: Function User Role foo AFC RoleSTLC Andrew STLC RoleAFC Ex correct: User Function Role Error Fox AFC RoleSTLC X Andrew STLC RoleAFC X The proper Function-Role association is defined within the lookup table Thank's for help ... View more