result[0] = elemCount;
      if (expectedCount == elemCount) {
        if (newCount == 0) {
          return deleteMe();
        }
        this.totalCount += newCount - elemCount;
        this.elemCount = newCount;
      }
      return this;
    }

    private @Nullable AvlNode<E> deleteMe() {
      int oldElemCount = this.elemCount;
      this.elemCount = 0;
      successor(pred(), succ());

      result[0] = elemCount;
      if (expectedCount == elemCount) {
        if (newCount == 0) {
          return deleteMe();
        }
        this.totalCount += newCount - elemCount;
        this.elemCount = newCount;
      }
      return this;
    }

    private @Nullable AvlNode<E> deleteMe() {
      int oldElemCount = this.elemCount;
      this.elemCount = 0;
      successor(pred(), succ());

    }

    /**
     * Deletes all documents associated with the specified session ID from the given index.
     *
     * @param searchEngineClient the search engine client to use for deletion
     * @param index the index name to delete documents from
     * @param sessionId the session ID to delete documents for
     * @return the number of documents that were deleted
     */

            reload(updater);
        }
    }

    /**
     * Deletes a character mapping item from the dictionary file.
     *
     * @param item the character mapping item to delete
     */
    @Override
    public synchronized void delete(final CharMappingItem item) {
        final CharMappingItem mappingItem = item;

                } else if (getParamValue(localParams, "event.delete", "delete").equals(eventType)) {
                    // deleted file
                    deleteDocument(localParams, dataMap);
                } else {
                    logger.warn("Unknown event type: '{}'. Supported: [create, modify, delete]. url={}", eventType,

                    .forEach(k -> addSystemProperty(cmdList, k.toString(), null, null));
        }
    }

    /**
     * Deletes the specified temporary directory.
     * Logs a warning if the directory cannot be deleted.
     *
     * @param ownTmpDir the temporary directory to delete
     */
    protected void deleteTempDir(final File ownTmpDir) {
        if (ownTmpDir == null) {
            return;
        }

    }

    /**
     * Deletes all words from the suggest index.
     *
     * @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));

            urlFilterService.delete(sid);
        } catch (final Exception e) {
            logger.warn("Failed to delete UrlFilter: sessionId={}", sid, e);
        }

        try {
            // clear queue
            urlQueueService.clearCache();
            urlQueueService.delete(sid);
        } catch (final Exception e) {
            logger.warn("Failed to delete UrlQueue: sessionId={}", sid, e);
        }

            }
        }

        /**
         * Deletes a single file and any empty parent directories.
         *
         * @param path the file path to delete
         */
        protected void deleteFile(final Path path) {
            try {
                Files.delete(path);
                if (logger.isDebugEnabled()) {
                    logger.debug("Deleted thumbnail file: {}", path);
                }

    }

    /**
     * Deletes a document asynchronously.
     *
     * @param request the delete request
     * @return a future for the delete response
     */
    @Override
    public ActionFuture<DeleteResponse> delete(final DeleteRequest request) {
        return client.delete(request);
    }

    /**
     * Deletes a document asynchronously with a callback.
     *