*
 * <ol>
 *   <li>First, if only one {@code Foo} is null, that null value is treated as <i>greater</i>
 *   <li>Next, non-null {@code Foo} values are passed to {@code getBarFunction} (we will be
 *       comparing {@code Bar} values from now on)
 *   <li>Next, if only one {@code Bar} is null, that null value is treated as <i>lesser</i>
 *   <li>Finally, natural ordering is used (i.e. the result of {@code Bar.compareTo(Bar)} is

      "index" : {
        "creation_date" : "1509021056731",
        "number_of_shards" : "5",
        "number_of_replicas" : "1",
        "uuid" : "MnnT8tsrT5GqpB8pYafyWg",
        "version" : {
          "created" : "6000051"
        },
        "provided_name" : "fess_config.role_type"
      }
    }
  }

      "index" : {
        "creation_date" : "1509021057304",
        "number_of_shards" : "5",
        "number_of_replicas" : "1",
        "uuid" : "gofu2g1ATH6L2rVweOWmtg",
        "version" : {
          "created" : "6000051"
        },
        "provided_name" : "fess_config.thumbnail_queue"
      }
    }
  }

    SettableFuture<String> future = SettableFuture.create();
    SettableFuture<String> nested = SettableFuture.create();
    assertTrue(future.setFuture(nested));
    // Later attempts to set the future should return false.
    assertFalse(future.set("x"));
    assertFalse(future.setException(new Exception("bar")));
    assertFalse(future.setFuture(SettableFuture.<String>create()));
    // Check that the future has been set properly.

      "index" : {
        "creation_date" : "1509021052830",
        "number_of_shards" : "5",
        "number_of_replicas" : "1",
        "uuid" : "WskRnE71Qsas-ki_GN3RSg",
        "version" : {
          "created" : "6000051"
        },
        "provided_name" : "fess_config.failure_url"
      }
    }
  }

                                    }
                                }
                            },
                        },
                    },
                    "summary": "Create an item",

 * Immutable empty instances are returned for collection types; {@code ""} for string; {@code 0} for
 * number types; reasonable default instance for other stateless types. For mutable types, a fresh
 * instance is created each time {@code get()} is called.
 *
 * @author Kevin Bourrillion
 * @author Ben Yu
 * @since 12.0
 */
@GwtIncompatible
@J2ktIncompatible
@ElementTypesAreNonnullByDefault

      "index" : {
        "creation_date" : "1509021054613",
        "number_of_shards" : "5",
        "number_of_replicas" : "1",
        "uuid" : "tqxL0WgAR665iLtdrY81AA",
        "version" : {
          "created" : "6000051"
        },
        "provided_name" : "fess_config.key_match"
      }
    }
  }

      "index" : {
        "creation_date" : "1509021055837",
        "number_of_shards" : "5",
        "number_of_replicas" : "1",
        "uuid" : "34AXOK0ITy6U7fzGItZJsQ",
        "version" : {
          "created" : "6000051"
        },
        "provided_name" : "fess_config.related_content"
      }
    }
  }

      "index" : {
        "creation_date" : "1509021054334",
        "number_of_shards" : "5",
        "number_of_replicas" : "1",
        "uuid" : "vIZ3R-jCRzGKaZvpZHRFPw",
        "version" : {
          "created" : "6000051"
        },
        "provided_name" : "fess_config.job_log"
      }
    }
  }