N1QL CBQ Update million records is not working

Hi,
I tried as you said, and the update time is huge. To update 10k records, its taking more than 2minutes. Below indexes are created in the bucket before executing update script:

CREATE INDEX USERID-IDX ON user-bucket(emailId) WHERE REVERSE(emailId) LIKE REVERSE(“%xxmail.com”);
CREATE INDEX USERIDIQ-IDX ON user-bucket(emailId) WHERE REVERSE(emailId) LIKE REVERSE(“%yymail.com”);