}

        eventCatapult.fire(ExecutionEvent.Type.ProjectDiscoveryStarted, session, null);

        Result<? extends ProjectDependencyGraph> graphResult = buildGraph(session);

        if (graphResult.hasErrors()) {
            return addExceptionToResult(
                    result, graphResult.getProblems().iterator().next().getException());
        }

        try {

        final AtomicBoolean hasError = new AtomicBoolean(false);

        Thread[] threads = new Thread[threadCount];

        for (int i = 0; i < threadCount; i++) {
            threads[i] = new Thread(() -> {
                try {
                    curtainFinallyHook.hook(assistantDirector);
                } catch (Exception e) {
                    hasError.set(true);
                }
            });

     * @return true if the operation was successful, false otherwise.
     */
    public boolean deleteAllWords() {
        final SuggestDeleteResponse response = suggester.indexer().deleteAll();
        if (response.hasError()) {
            logger.warn("Failed to delete all words.", response.getErrors().get(0));
            return false;
        }
        refresh();
        return true;
    }

    /**