[N1QL/FTS] Need to document the effect of bleveMaxResultWindow on search resultsets

FTS/Bleve caps the number of results an FTS search request can match and return to 10000 (default). This is so a search request doesn't over consume resources.

This setting is configurable and the setting name is bleveMaxResultWindow, and this command will update this setting for the search service cluster-wide (applicable to all incoming queries).

curl -XPUT -H "Content-type:application/json" http://<username>:<password>@<ip>:8094/api/managerOptions -d '{"bleveMaxResultWindow": "100000"}' 

Note, that with flex queries, with the score:none optimization - FTS will not apply this limitation.