Elasticsearch Segment Count Too High
Elasticsearch too many segments causes slow search when merges cannot keep up.
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Elasticsearch fixes
Published troubleshooting guides for elasticsearch issues.
Elasticsearch Fielddata Memory Exhaustion
Elasticsearch fielddata cache grows unbounded on text fields with aggregations.
Elasticsearch Coordinating Node Overload
Elasticsearch coordinating nodes are overloaded when query fanout is high.
Elasticsearch Data Node Hot Spot
Elasticsearch data distribution is uneven when shard allocation awareness is wrong.
Elasticsearch Ingest Pipeline Processor Fail
Elasticsearch ingest processors fail when grok patterns do not match.
Elasticsearch Beats Input Not Receiving
Elasticsearch does not receive data when Beats output is misconfigured.
Elasticsearch Logstash Pipeline Backpressure
Elasticsearch indexing is slow when Logstash pipeline has backpressure.
Elasticsearch kNN Query Inaccurate
Elasticsearch kNN search returns wrong results when ef_search is too low.
Elasticsearch Vector Search HNSW OOM
Elasticsearch HNSW vector search causes OOM when index is too large.
Elasticsearch Enrich Policy Not Updating
Elasticsearch enrich policy does not update when source indices change.
Elasticsearch Transform Job Failed
Elasticsearch transform jobs fail when source index mapping changes.
Elasticsearch CCR Follow Index Lagging
Elasticsearch cross-cluster replication follower falls behind when leader is slow.
Elasticsearch Remote Cluster Unreachable
Elasticsearch cross-cluster search fails when remote seed nodes are down.
Elasticsearch Searchable Snapshot Not Mounting
Elasticsearch searchable snapshots fail to mount when S3 repository is unreachable.
Elasticsearch Runtime Field Slow
Elasticsearch runtime fields cause slow queries when computed on many docs.
Elasticsearch Parent Child Join Slow
Elasticsearch has_parent/has_child queries are slow when relations are deep.
Elasticsearch Nested Query Performance
Elasticsearch nested queries are slow when nested docs are large.
Elasticsearch Geo Shape Indexing Error
Elasticsearch geo_shape fields fail to index when polygon is invalid.
Elasticsearch Percolator Query Not Matching
Elasticsearch percolator queries do not match when document structure differs.
Elasticsearch Aggregation Memory Limit
Elasticsearch aggregations fail when bucket memory limit is exceeded.
Elasticsearch SQL Query Slow
Elasticsearch SQL queries are slow when translation to DSL is inefficient.
Elasticsearch ML Job Failed
Elasticsearch machine learning jobs fail when datafeed query is invalid.
Elasticsearch Watcher Alert Not Sending
Elasticsearch Watcher alerts fail when email configuration is wrong.
Elasticsearch X-Pack License Expired
Elasticsearch features are disabled when commercial license expires.
Elasticsearch SSL Certificate Validation Failed
Elasticsearch TLS connections fail when CA certificate is not trusted.
Elasticsearch Security Token Expired
Elasticsearch API tokens expire when service account token TTL is reached.
Elasticsearch Component Template Conflict
Elasticsearch component templates conflict when composable templates overlap.
Elasticsearch Template Not Matching
Elasticsearch index template does not match when index patterns are wrong.
Elasticsearch Data Stream Not Rollover
Elasticsearch data stream does not rollover when write index is not set.
Elasticsearch ILM Policy Not Applying
Elasticsearch index lifecycle policies do not apply when rollover conditions are not met.
Elasticsearch Restore Incompatible Version
Elasticsearch snapshot restore fails when index was created in incompatible version.
Elasticsearch Snapshot Failed
Elasticsearch snapshot fails when repository is not accessible or space is full.
Elasticsearch Reindex Slow
Elasticsearch reindex operation is slow when scroll size or concurrency is low.
Elasticsearch Bulk Request Failed
Elasticsearch bulk indexing fails when single document in batch is rejected.
Elasticsearch Refresh Interval Impact
Elasticsearch indexing performance suffers when refresh_interval is too aggressive.
Elasticsearch Translog Sync Failed
Elasticsearch translog fsync fails when disk IO errors occur.
Elasticsearch Merge Scheduler Throttling
Elasticsearch segment merges are throttled when IO is saturated.
Elasticsearch Recovery Slow
Elasticsearch shard recovery is slow when concurrent_streams is too low.
Elasticsearch Mapping Conflict
Elasticsearch document indexing fails when field type conflicts with existing mapping.
Elasticsearch Query DSL Syntax Error
Elasticsearch queries fail when JSON syntax or query structure is invalid.
Elasticsearch Circuit Breaker Tripped
Elasticsearch circuit breaker prevents OOM by rejecting requests when memory is high.
Elasticsearch Index Readonly Block
Elasticsearch index becomes read-only when disk watermark is exceeded.
Elasticsearch Shard Allocation Failed
Elasticsearch shards remain unassigned when allocation deciders block placement.
Elasticsearch Split Brain Scenario
Elasticsearch cluster splits into two masters when network partitions occur.
Elasticsearch Master Not Elected
Elasticsearch cluster has no master when quorum cannot be reached.
Elasticsearch Disk Watermark Exceeded
Elasticsearch stops shard allocation when disk usage exceeds flood watermark.
Elasticsearch Out of Memory Error
Elasticsearch heap space is exhausted when indices exceed allocated memory.
Elasticsearch Node Not Joining Cluster
Elasticsearch node does not join cluster when discovery configuration is wrong.
Elasticsearch Yellow Status Replica Shards
Elasticsearch cluster health is yellow when replica shards cannot be allocated.
Elasticsearch Cluster Red Status
Elasticsearch cluster health is red when primary shards are unassigned.