FailEngine threw exception – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch encounters an issue with the search engine, causing it to fail. This could be due to a variety of reasons such as corrupted indices, insufficient disk space, or hardware failure. To resolve this issue, you could try to restore the corrupted indices from a backup, free up disk space or check the hardware for any faults. Additionally, you could also check the OpenSearch logs for more detailed information about the error, which could help in identifying the root cause and fixing it.

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This guide will help you check for common problems that cause the log ” failEngine threw exception ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “failEngine threw exception” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                    eventListener.onFailedEngine(reason; failure);
            } catch (Exception inner) {
                if (failure != null) inner.addSuppressed(failure);
                // don't bubble up these exceptions up
                logger.warn("failEngine threw exception"; inner);
        } else {
                () -> new ParameterizedMessage(
                    "tried to fail engine but could not acquire lock - engine should " + "be failed by now [{}]";


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