iterate sphinx queries in captionAssetItem->searchEntries

SUP-1669 #time 4h
added consts
removed redundant variables
no entry filter used in API call
pagaing fix & limit seting to sphinx instead of slice

SUP-1669 #time 2h
set sphinx limit instead of max_matches
merging for loops , proper paging & a typo
Merge pull request #1235 from kaltura/IX-9.17.0-SUP-1669

Ix 9.17.0 sup 1669