OptionalfilterOptionalgeometryReturns the geometry used for proximity search.
OptionalprojectionReturns the projection to use for search geometry.
OptionalregexReturns the regular expression used to search all the fields. If empty, then the regular expression is not used.
OptionalsearchReturns the search radius for proximity search (in meters). The default is 0.
Returns the string based search expression. If empty, then search expression is not used.