* <ol>
 *   <li>A pipeline starts at its leaf step (or steps), which is created from either a callable
 *       block or a {@link ListenableFuture}.
 *   <li>Each other step is derived from one or more input steps. At each step, zero or more objects
 *       can be captured for later closing.
 *   <li>There is one last step (the root of the tree), from which you can extract the final result

    /** The key of the message: Zero Hits */
    public static final String LABELS_searchlog_log_type_search_zerohit = "{labels.searchlog_log_type_search_zerohit}";

    /** The key of the message: Zero Clicks */
    public static final String LABELS_searchlog_log_type_search_zeroclick = "{labels.searchlog_log_type_search_zeroclick}";