/**
     * The flag to use ECS format.
     */
    protected boolean useEcsFormat = false;

    /**
     * The ECS version.
     */
    protected String ecsVersion = "1.2.0";

    /**
     * The ECS service name.
     */
    protected String ecsServiceName = "fess";

    /**
     * The ECS event dataset.
     */
    protected String ecsEventDataset = "app";