}

  /**
   * Starts a {@link ClosingFuture} pipeline with a {@link ListenableFuture}.
   *
   * <p>If {@code future} succeeds, its value will be closed (using {@code closingExecutor)}) when
   * the pipeline is done, even if the pipeline is canceled or fails.
   *
   * <p>Cancelling the pipeline will not cancel {@code future}, so that the pipeline can access its
   * value in order to close it.
   *

  }

  /**
   * Starts a {@link ClosingFuture} pipeline with a {@link ListenableFuture}.
   *
   * <p>If {@code future} succeeds, its value will be closed (using {@code closingExecutor)}) when
   * the pipeline is done, even if the pipeline is canceled or fails.
   *
   * <p>Cancelling the pipeline will not cancel {@code future}, so that the pipeline can access its
   * value in order to close it.
   *

    /** List of rewrite rules for document mappings */
    protected final List<UnaryOperator<String>> docMappingRewriteRuleList = new ArrayList<>();

    /** Whether to use pipelines for document processing */
    protected boolean usePipeline = false;

    /**
     * Adds an index configuration file path to be loaded.
     *
     * @param path path to the index configuration file
     */