How to use

transientSettings

method

in

org.elasticsearch.action.admin.cluster.settings.ClusterUpdateSettingsRequest

final boolean successful = tc.admin().cluster()
    .updateSettings(new ClusterUpdateSettingsRequest()
    .transientSettings(ENABLE_ALL_ALLOCATIONS_SETTINGS)
    .persistentSettings(ENABLE_ALL_ALLOCATIONS_SETTINGS))
    .actionGet()

/**
 * Sets the transient settings to be updated. They will not survive a full cluster restart
 */
public ClusterUpdateSettingsRequestBuilder setTransientSettings(Settings.Builder settings) {
  request.transientSettings(settings);
  return this;
}

/**
 * Sets the transient settings to be updated. They will not survive a full cluster restart
 */
public ClusterUpdateSettingsRequestBuilder setTransientSettings(Map settings) {
  request.transientSettings(settings);
  return this;
}

/**
 * Sets the transient settings to be updated. They will not survive a full cluster restart
 */
public ClusterUpdateSettingsRequestBuilder setTransientSettings(Settings settings) {
  request.transientSettings(settings);
  return this;
}

/**
 * Sets the source containing the transient settings to be updated. They will not survive a full cluster restart
 */
public ClusterUpdateSettingsRequestBuilder setTransientSettings(String settings, XContentType xContentType) {
  request.transientSettings(settings, xContentType);
  return this;
}

  @Override
  public ClusterState execute(final ClusterState currentState) {
    final ClusterState clusterState =
        updater.updateSettings(
            currentState,
            clusterSettings.upgradeSettings(request.transientSettings()),
            clusterSettings.upgradeSettings(request.persistentSettings()),
            logger);
    changed = clusterState != currentState;
    return clusterState;
  }
});

@Override
protected ClusterBlockException checkBlock(ClusterUpdateSettingsRequest request, ClusterState state) {
  // allow for dedicated changes to the metadata blocks, so we don't block those to allow to "re-enable" it
  if (request.transientSettings().size() + request.persistentSettings().size() == 1) {
    // only one setting
    if (MetaData.SETTING_READ_ONLY_SETTING.exists(request.persistentSettings())
      || MetaData.SETTING_READ_ONLY_SETTING.exists(request.transientSettings())
      || MetaData.SETTING_READ_ONLY_ALLOW_DELETE_SETTING.exists(request.transientSettings())
      || MetaData.SETTING_READ_ONLY_ALLOW_DELETE_SETTING.exists(request.persistentSettings())) {
      // one of the settings above as the only setting in the request means - resetting the block!
      return null;
    }
  }
  return state.blocks().globalBlockedException(ClusterBlockLevel.METADATA_WRITE);
}

/**
 * Sets the transient settings to be updated. They will not survive a full cluster restart
 */
@SuppressWarnings({"unchecked", "rawtypes"})
public ClusterUpdateSettingsRequest transientSettings(Map source) {
  try {
    XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
    builder.map(source);
    transientSettings(Strings.toString(builder), builder.contentType());
  } catch (IOException e) {
    throw new ElasticsearchGenerationException("Failed to generate [" + source + "]", e);
  }
  return this;
}

@Override
public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
  final ClusterUpdateSettingsRequest clusterUpdateSettingsRequest = Requests.clusterUpdateSettingsRequest();
  clusterUpdateSettingsRequest.timeout(request.paramAsTime("timeout", clusterUpdateSettingsRequest.timeout()));
  clusterUpdateSettingsRequest.masterNodeTimeout(
      request.paramAsTime("master_timeout", clusterUpdateSettingsRequest.masterNodeTimeout()));
  Map<String, Object> source;
  try (XContentParser parser = request.contentParser()) {
    source = parser.map();
  }
  if (source.containsKey(TRANSIENT)) {
    clusterUpdateSettingsRequest.transientSettings((Map) source.get(TRANSIENT));
  }
  if (source.containsKey(PERSISTENT)) {
    clusterUpdateSettingsRequest.persistentSettings((Map) source.get(PERSISTENT));
  }
  return channel -> client.admin().cluster().updateSettings(clusterUpdateSettingsRequest, new RestToXContentListener<>(channel));
}

/**
 * Sets the transient settings to be updated. They will not survive a full cluster restart
 */
public ClusterUpdateSettingsRequestBuilder setTransientSettings(Settings.Builder settings) {
  request.transientSettings(settings);
  return this;
}

/**
 * Sets the source containing the transient settings to be updated. They will not survive a full cluster restart
 */
public ClusterUpdateSettingsRequestBuilder setTransientSettings(String settings, XContentType xContentType) {
  request.transientSettings(settings, xContentType);
  return this;
}

/**
 * Sets the transient settings to be updated. They will not survive a full cluster restart
 */
public ClusterUpdateSettingsRequestBuilder setTransientSettings(Settings settings) {
  request.transientSettings(settings);
  return this;
}

/**
 * Sets the transient settings to be updated. They will not survive a full cluster restart
 */
public ClusterUpdateSettingsRequestBuilder setTransientSettings(Settings settings) {
  request.transientSettings(settings);
  return this;
}

/**
 * Sets the source containing the transient settings to be updated. They will not survive a full cluster restart
 */
public ClusterUpdateSettingsRequestBuilder setTransientSettings(String settings, XContentType xContentType) {
  request.transientSettings(settings, xContentType);
  return this;
}

/**
 * Sets the transient settings to be updated. They will not survive a full cluster restart
 */
public ClusterUpdateSettingsRequestBuilder setTransientSettings(Settings.Builder settings) {
  request.transientSettings(settings);
  return this;
}

/**
 * Sets the transient settings to be updated. They will not survive a full cluster restart
 */
public ClusterUpdateSettingsRequestBuilder setTransientSettings(Map settings) {
  request.transientSettings(settings);
  return this;
}

/**
 * Sets the transient settings to be updated. They will not survive a full cluster restart
 */
public ClusterUpdateSettingsRequestBuilder setTransientSettings(Map settings) {
  request.transientSettings(settings);
  return this;
}

/**
 * Sets the source containing the transient settings to be updated. They will not survive a full cluster restart
 * @deprecated use {@link #setTransientSettings(String, XContentType)} to avoid content type detection
 */
@Deprecated
public ClusterUpdateSettingsRequestBuilder setTransientSettings(String settings) {
  request.transientSettings(settings);
  return this;
}

  @Override
  public ClusterState execute(final ClusterState currentState) {
    ClusterState clusterState = updater.updateSettings(currentState, request.transientSettings(), request.persistentSettings());
    changed = clusterState != currentState;
    return clusterState;
  }
});

  @Override
  public ClusterState execute(final ClusterState currentState) {
    final ClusterState clusterState =
        updater.updateSettings(
            currentState,
            clusterSettings.upgradeSettings(request.transientSettings()),
            clusterSettings.upgradeSettings(request.persistentSettings()),
            logger);
    changed = clusterState != currentState;
    return clusterState;
  }
});