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Syntax: empty, or an integer
The maximum number of Group Bys to perform during a search; the
default (if empty) is to perform all Group Bys set (that are not
already used in an exact-match infield
query). Reducing the
number of Group Bys performed (i.e. by reducing Max Group Bys) can
improve search performance and reduce search load; unperformed (but
set) Group Bys will have links in the output for the user to choose to
expand them.
See here for more details on using Group By.
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