What Is OpenSearch Flush? In OpenSearch, flushing is the process of permanently storing data onto disk for all operations that have been temporarily stored in memory. This process is also known as a Lucene commit. How Are OpenSearch Documents Indexed? To understand the importance of flushing, it is essential to know how OpenSearch indexes documents. […]
The Split Index API in OpenSearch is a useful feature that allows you to split an existing index into multiple smaller indices. This can be particularly valuable when you want to improve performance, scale your index, or rebalance the data without re-ingesting it. What is the Split Index API? The Split Index API enables you to take […]
Reindexing is an essential Elasticsearch operation that enables administrators to copy documents from one index to another, either within the same cluster or across clusters. This guide provides examples of reindexing and monitoring tasks, including cross-cluster reindexing, along with references to the official Elasticsearch documentation. Basic Reindexing Example The following example demonstrates how to copy […]
OpenSearch, a powerful open-source search and analytics engine, provides robust cluster management features to ensure efficient data distribution and availability. One of these key features is the routing allocation settings, which dictate how shards (data fragments) are distributed across nodes in a cluster. In this article, we’ll take a closer look at a specific configuration, […]
OpenSearch Dashboards is a powerful tool for visualizing and interacting with your OpenSearch data. However, to make the most of it, you need to understand its configuration settings related to logging. Below, we dive into some key options and what they mean for your deployment.  1. Logging Queries with opensearch.logQueriesThis setting enables the logging of […]
If you’ve worked with OpenSearch or Elasticsearch and encountered “No ‘Basic Authorization’ header, send 401 and ‘WWW-Authenticate Basic'” warning in your logs, you’re not alone. This message typically appears when a client makes a request to the cluster but does not include the required Authorization header. As a result, the server responds with a 401 Unauthorized status and […]
As an Elasticsearch administrator, using the Dev Tools Console in Kibana can significantly simplify cluster management and troubleshooting. Below is a curated list of useful commands to monitor and manage your Elasticsearch environment effectively. 1. Node and Disk AllocationCheck the distribution of shards and disk usage across nodes: 2. Field Data StatisticsView memory usage for […]
The error index.max.regex_length in OpenSearch is related to the maximum length of regular expressions that can be used in index settings. This setting controls the maximum length of a regular expression used during index creation or mapping, and when a regex pattern exceeds this length, you will encounter an error. To fix this, you can adjust the index.max.regex_length […]
OpenSearch can enforce read-only states on clusters or indices to protect against issues like low disk space or cluster instability. Understanding and resolving these blocks is crucial for maintaining a healthy and operational cluster. Below is a guide to address common scenarios. How to Resolve cluster.blocks.read_only The cluster.blocks.read_only setting typically occurs when OpenSearch detects a critical issue, […]
In this guide, I will tell you how to prevent BufferOverflowError when you get logs from Kafka/in_tail, and your output can’t connect to OpenSearch/ElasticSearch. If you use input from Kafka/in_tail and sometimes you have issues with connection to OpenSearch/ElasticSearch, you can customize your Fluentd buffer in the output to stop getting logs from the input […]