code: @Description("apoc.index.relationships('TYPE','prop:value*') YIELD rel - lucene query on relationship index with the given type name")
      @Procedure(mode = Mode.READ)
      public Stream<WeightedRelationshipResult> relationships(@Name("type") String type, @Name("query") String query) throws Exception {
          if (!db.index().existsForRelationships(type)) return Stream.empty();
          return toWeightedRelationshipResult(db.index().forRelationships(type).query(query,null,null));
      }
docs: CALL apoc.index.relationships('CHECKIN','on:2010-*')