OnAcquired onResponse should not throw – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.7-8.9

Briefly, this error occurs when an exception is thrown within the onResponse method of an Elasticsearch listener. This is not expected behavior as onResponse should handle the response from Elasticsearch and not throw any exceptions. To resolve this issue, you should review your onResponse implementation to ensure it properly handles all possible responses. This could involve adding appropriate error handling and exception catching mechanisms. Additionally, ensure that the Elasticsearch cluster is healthy and responding correctly to avoid unexpected responses that could trigger exceptions.

This guide will help you check for common problems that cause the log ” onAcquired#onResponse should not throw ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, response, shard.

Log Context

Log “onAcquired#onResponse should not throw” classname is IndexShardOperationPermits.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                final Releasable combined = Releasables.wrap(releasable; released);
                try {
                } catch (Exception e) {
                    logger.error("onAcquired#onResponse should not throw"; e);
                    assert false : e; // should not throw; we cannot do anything with this exception


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