| Sets the number of other words permitted between words in query phrase.
If zero, then this is an exact phrase search. For larger values this works
like a WITHIN or NEAR operator.
The slop is in fact an edit-distance, where the units correspond to
moves of terms in the query phrase out of position. For example, to switch
the order of two words requires two moves (the first move places the words
atop one another), so to permit re-orderings of phrases, the slop must be
at least two.
More exact matches are scored higher than sloppier matches, thus search
results are sorted by exactness.
The slop is zero by default, requiring exact matches.
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