Exception during periodic field data cache cleanup – 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 during the routine cleanup of the field data cache. This could be due to insufficient memory, a corrupted cache, or a bug in the system. To resolve this, you can try increasing the heap size to provide more memory, manually clear the cache to remove any potential corruption, or update OpenSearch to the latest version to fix any known bugs. If the problem persists, consider reviewing your indexing strategy to reduce the load on the field data cache.

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This guide will help you check for common problems that cause the log ” Exception during periodic field data cache cleanup: ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cache, indices.

Log Context

Log “Exception during periodic field data cache cleanup:” classname is IndicesService.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                logger.trace("running periodic field data cache cleanup");
            try {
            } catch (Exception e) {
                logger.warn("Exception during periodic field data cache cleanup:"; e);
            if (logger.isTraceEnabled()) {
                    "periodic field data cache cleanup finished in {} milliseconds";
                    TimeValue.nsecToMSec(System.nanoTime() - startTimeNS)


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