Failed to properly close watcher bulk processor – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch is unable to close the watcher bulk processor correctly. This could be due to a variety of reasons such as a network issue, a heavy load on the cluster, or a sudden shutdown. To resolve this issue, you can try restarting the Elasticsearch service, ensuring that the cluster is not overloaded, and checking the network connectivity. If the problem persists, consider increasing the timeout settings or optimizing your indexing strategy to reduce the load on the Elasticsearch cluster.

This guide will help you check for common problems that cause the log ” failed to properly close watcher bulk processor ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, bulk.

Log Context

Log “failed to properly close watcher bulk processor” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

    public void close() throws IOException {
        try {
            if (enabled && bulkProcessor.awaitClose(10; TimeUnit.SECONDS) == false) {
                logger.warn("failed to properly close watcher bulk processor");
        } catch (InterruptedException e) {