Failed to flush after setting shard to inactive – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 1.3-1.3

Briefly, this error occurs when Elasticsearch is unable to flush data to disk after marking a shard as inactive. This could be due to insufficient disk space, hardware failure, or a network issue. To resolve this, you can try freeing up disk space, checking the hardware for any faults, or investigating network connectivity issues. Additionally, check your Elasticsearch logs for more detailed error messages that could help identify the root cause. You may also need to consider increasing the timeout settings if the operation is taking longer than expected.

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

Log Context

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

                 } catch (EngineClosedException e) {
                    // ignore
                } catch (FlushNotAllowedEngineException e) {
                    // ignore
                } catch (Throwable e) {
                    logger.warn("failed to flush after setting shard to inactive"; e);
            } else {
                logger.debug("updating index_buffer_size from [{}] to [{}]"; preValue; indexingBufferSize);


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