Remove limit for search result summary
Remove limit for search result summary

Setting `number_of_fragments` to `0` will show all
the contents of the field instead of a fragment
surrounding the highlighted match.

https://www.elastic.co/guide/en/elasticsearch/reference/current/search-request-highlighting.html
 setting to ES query

Setting 'no_match_size' ensures the 'highlights'
field will always contain properties for each
field we search (set in `mappings/services.json`).

alphagov/digitalmarketplace-search-api,alphagov/digitalmarketplace-search-api