code: public Redis format(RedisFormat format) {
          String strFormat;
          switch (format) {
              case JSON_INTERACTION_META:
                  strFormat = "json_interaction_meta";
                  break;
              default:
              case JSON_INTERACTION:
                  strFormat = "json_interaction";
                  break;
          }
          return setParam("format", strFormat);
      }
docs: /*
  The output format for your data:
  json_interaction_meta - This is specific to the Redis connector for now. Each interaction is sent separately
  except it is framed with metadata.
  json_interaction - This is specific to the Redis connector for now. Each interaction is sent separately with
  no metadata.
  If you omit this parameter or set it to json_interaction_meta, each interaction will be delivered  with
  accompanying metadata. Both the interactions and the metadata are delivered as JSON objects.
  <p/>
  Take a look at our Sample Output for File-Based Connectors page.
  <p/>
  If you select json_interaction, DataSift omits the metadata and sends each interaction as a single JSON object.
  
  @return this