An equality index is used to match values that correspond exactly (though generally without case sensitivity) to the value provided in the search filter. An equality index requires clients to match values without wildcards or misspellings.
$ ldapsearch --port 1389 --baseDN dc=example,dc=com "(uid=bjensen)" mail dn: uid=bjensen,ou=People,dc=example,dc=com mail: bjensen@example.com

