code: public SearchRequestBuilder getSearchRequestBuilder(boolean isSetExplain,
              String[] indices, String[] types) {
          return getSearchRequestBuilder(isSetExplain, indices, types, null);
      }
docs: Gets search request builder.
  
  @param isSetExplain the is set explain
  @param indices      the indices
  @param types        the types
  @return the search request builder