OpenSearch
Open-source search and analytics suite derived from Elasticsearch, offering search, logging, and observability.
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A truly open-source fork of Elasticsearch with full features and no license restrictions.
Core Features
- Full-text search with advanced ranking
- Real-time log ingestion and visualization via Dashboards
- Distributed architecture scaling to petabytes
- Built-in security, alerting, and ML plugins
- Native integration with AWS OpenSearch Service
What It Can't Do
- •Default config is for development; adjust JVM heap, network binds in `config/opensearch.yml` for production. 2. Do NOT mix clusters with Elasticsearch 7.x+ due to API differences. 3. Use Java 17 LTS for best compatibility.
Use Cases
- Site/application search engine
- Centralized log management and analysis
- Security incident and event monitoring (SIEM)
- Business metrics monitoring and observability
Detailed Introduction
OpenSearch is an open-source search and analytics suite derived from Elasticsearch. It provides powerful full-text search, real-time analytics, log ingestion, and visualization capabilities. Designed for enterprises, it scales to handle petabytes of data while maintaining performance. Key features include a RESTful API, distributed architecture, security plugins, alerting, and machine learning integration. As a community-driven project under the Linux Foundation, it offers a vendor-neutral alternative to Elasticsearch with complete Apache 2.0 licensing, ensuring no lock-in. It's ideal for application search, log analytics, SIEM, and observability use cases.
Troubleshooting & FAQ (2)
TroubleshootingHow to fix 'protoc' not found error when building OpenSearch from source?
The build requires the Protocol Buffers compiler (protoc). Install protoc in your environment: on Ubuntu/Debian, run 'sudo apt-get install protobuf-compiler'; on macOS, use 'brew install protobuf'; for GitHub Actions, add a step using 'setup-protoc' action. Alternatively, for Java-only builds, the gradle plugin manages protoc automatically.
TroubleshootingWhy does scripted_metric aggregation throw NullPointerException when used with composite aggregation in OpenSearch 3.3.0+?
This is a known regression (issue #21507) introduced by PR #19006 in OpenSearch 3.3.0–3.5.0. The scripted_metric sub-aggregation fails with a NullPointerException on all shards when inside a composite aggregation because the bucket result can be null for empty shards, and the code dereferences result.getClass() before a null check. Workarounds: (1) downgrade to 3.2.0 or earlier, (2) avoid scripted_metric inside composite, or (3) modify your combine_script to return a non‑null default (e.g., return state == null ? 0 : state.n) so that the null result is never produced. Track the issue for a permanent fix.
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Getting Started
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Install the software
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Step 1: Download the tarball or ZIP from the official site for your OS
Step 2: Extract and run `./opensearch` (Linux/macOS) or `opensearch.bat` (Windows)
Step 3: Verify by visiting http://localhost:9200 (default port)
- Step 1: Download the tarball or ZIP from the official site for your OS
- Step 2: Extract and run `./opensearch` (Linux/macOS) or `opensearch.bat` (Windows)
- Step 3: Verify by visiting http://localhost:9200 (default port)
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