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{color:#333333}In addition to the Boolean operators ('AND', 'OR', 'NOT') used to construct complex queries with sub-queries, there are operators that are used at the term level, within term lists. They are written immediately before a term, without white space.{color}
* '+' - Require a term - it must be present in documents
* '-' - Exclude a term - it must not be present in documents
* Relational operators - '==", '\!=', '<', '<=', '>', and '>='. White space is permitted after the operator.

{color:#333333}Term operators, field names, keyword options, and prefix modifiers can be written in any order. For example:{color}

{color:#333333}{{{}title:>cat{}}}{color}

{color:#333333}{{>title:cat{}}}{color}

{color:#333333}{{\+title:dog{}}}{color}

{color:#333333}{{{}title:+dog{}}}{color}

{color:#333333}{{\-title:frog{}}}{color}

{color:#333333}{{{}title:==frog{}}}{color}

{color:#333333}{{==title:frog{}}}{color}

{color:#333333}{{{}nostem:+title:bats{}}}{color}