This series shares resources about running Elasticsearch clusters in production, such as configuration, troubleshooting, and cluster behavior understanding.
Slow Query Logs In Elasticsearch
Better understand the slow queries in Elasticsearch by using the slow logs. In this article, we discuss the log structure, the thresholds, and some potential root causes.
27 Nov 2021
This article describes the different types of settings of Elasticsearch: cluster settings, index settings, node settings, the difference between static and dynamic settings, and some commonly used curl commands.
21 Aug 2021
How to prevent data loss in Elasticsearch?
Six practical solutions to improve data reliability: improve number of replicas, snapshot and restore, RAID, MQ, etc.
31 Jul 2021
Fix Corrupted Index in Elasticsearch
How to fix corrupted index in Elasticsearch cluster without snapshot?
14 Jul 2021
Disk Watermarks In Elasticsearch
Understanding different disk watermarks: low, high, and flood-stage in Elasticsearch. The symptom when the cluster reaches these values and how to mitigate or avoid the issues. Also, how to better operate your clusters using these watermarks.
10 Apr 2021
18 Allocation Deciders in Elasticsearch
This article explains the 18 allocation deciders in Elasticsearch: when they decide to allow, deny, or throttle the shard allocation under different circumstances. Also, a complete list of messages for unassigned shards.
27 Sep 2020
Elasticsearch: Common Index Exceptions
Explain the common Elasticsearch exceptions occurred when indexing new documents, with sample messages, analysis, suggestions and external resources for further investigation.
13 Sep 2020
GC in Elasticsearch
Basic information about garbage collection (GC) in Elasticsearch, including the default garbage collector used, JVM options, GC logging, and more.
30 Aug 2020
Discovery in Elasticsearch
How does discovery work in Elasticsearch? This article explains different mechanisms of discovery, the key settings, fault detection, related logs, and more.
22 Aug 2020