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Operator Behavior
  Default. Find any record containing one or more of the words. (eg Red House)
+ Word mandatory. (ex red +)
-
Word to avoid. (ex, red)
< Decreases the relevance of a word. (ex
> Increase the relevance of a word. (ex >black)
( )
Increase priority to the expression in it. (ex (Red House))
~
Decreases priority to the expression (ex ~red)
* Begin by. (ex, social*)
The expression contained in them is interpreted literally.