Io exception while building ‘store stats’ – How to solve this Elasticsearch error

Opster Team

March-22, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration 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 ” io exception while building ‘store stats’ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: shard, index.

Log Context

Log “io exception while building ‘store stats'”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

final long reservedBytes = bytesStillToRecover == -1 ? StoreStats.UNKNOWN_RESERVED_BYTES : bytesStillToRecover;
 return store.stats(reservedBytes; LongUnaryOperator.identity());
 } catch (IOException e) {
 failShard("Failing shard because of exception during storeStats"; e);
 throw new ElasticsearchException("io exception while building 'store stats'"; e);
 public MergeStats mergeStats() {
 final Engine engine = getEngineOrNull();


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