Searching the UCS database uses the Lucene syntax, described at http://lucene.apache.org/core/3_6_0/queryparsersyntax.html.
Some samples follow.
This query searches for all records having a key FirstName whose value is any word starting with "kristin."
FirstName:Kim AND LastName:Brown AND EmailAddress:hotmail
This query searches on three attributes: FirstName containing "Kim," LastName containing "Brown," and EmailAddress containing "hotmail."
This query searches for all records having an attribute Text which contains words starting with "complain."