anchor.diff:  * `search_result_uuid` - value of `uuid` field from search response this statistics record is for 
   * `hit_id` - unique identifier of search hit document (`hits/hits[]/_id` field 
   in response) from given search response which was "useful" for user (eg. he clicked it 
  -or viewed detail). Validation is performed during DCP side record write to ensure this 
  -identifier was part of given search response. 
  +or viewed detail). Validation is performed during server side record write to ensure this 
  +identifier has been part of given search response. 
   * `session_id` - optional, identifier of user's frontend session to allow more precise user behavior analyze
   
   PUT /rest/search/{search_result_uuid}/{hit_id}?{session_id}
  
positive.code: {
    "authenticated":true
  }
  
  
  --
  
negative.code: * `hits` object containing info about search hits
  * `hits/total` total number of documents matching search request - search hits
  * `hits/hits` array with documents forming part of search hits matching `from` and `size` request parameters
  * `hits/hits/_id` unique identifier of document in Searchisko
  * `hits/hits/fields` document fields, see `field` request parameter
  * `hits/hits/highlight` highlights of fulltext matching in given document, see `query_highlight` request parameter
  * `facets` values from facets, see `facet` request parameter
  