});
                } catch (final Exception e) {
                    logger.warn("Failed to send a test mail.", e);
                } finally {
                    SMailCallbackContext.clearPreparedMessageHookOnThread();
                }
            }
            resultBuf.append("Status of ")
                    .append(ping.getClusterName())
                    .append(" is changed to ")

                });
            } catch (final Exception e) {
                logger.warn("Failed to send log notification.", e);
            } finally {
                SMailCallbackContext.clearPreparedMessageHookOnThread();
            }
        }

        final BulkRequestBuilder bulkDelete = client.prepareBulk();
        for (final String docId : docIds) {