code: private SearchRequestBuilder createFrequentlyRelatedContentSearch(RelatedItemSearch search, Client searchClient) {
          SearchRequestBuilder sr = searchClient.prepareSearch();
          sr.internalBuilder(builder.createFrequentlyRelatedContentSearch(search));
          sr.setIndices(indexName);
          return sr;
  
      }
docs: /*
  Creates a query like:
  
  {
  "size" : 0,
  "timeout" : 5000,
  "query" : {
  "constant_score" : {
  "filter" : {
  "bool" : {
  "must" : [ {
  "term" : {
  "related-with" : "apparentice you're hired"
  }
  }, {
  "term" : {
  "channel" : "bbc"
  }
  } ]
  }
  }
  }
  },
  "facets" : {
  "frequently-related-with" : {
  "terms" : {
  "field" : "id",
  "size" : 5,
  "execution_hint" : "map"
  }
  }
  }
  }