Failed to flush shard post recovery – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Failed to flush shard post recovery ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: flush, index, recovery and shard.

Log Context

Log “failed to flush shard post recovery” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                } catch (IllegalIndexShardStateException | FlushNotAllowedEngineException e) {
                    // we are being closed; or in created state; ignore
                    // OR; we are not allowed to perform flush; ignore
                } catch (Throwable e) {
                    logger.warn("failed to flush shard post recovery"; e);
            return left;
        } finally {


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