# OpenSearch — Community-Driven Search and Analytics Suite

> OpenSearch is an open-source search and analytics suite forked from Elasticsearch 7.10. It provides full-text search, log analytics, observability, and security analytics — all under the Apache-2.0 license with no feature restrictions.

## Install

Save in your project root:

# OpenSearch — Community-Driven Search and Analytics Suite

## Quick Use
```bash
# Run with Docker
docker run -d --name opensearch \
  -p 9200:9200 -p 9600:9600 \
  -e "discovery.type=single-node" \
  -e "DISABLE_SECURITY_PLUGIN=true" \
  opensearchproject/opensearch:latest

# Index a document
curl -X POST "localhost:9200/products/_doc" \
  -H "Content-Type: application/json" \
  -d '{"name": "Widget", "price": 29.99, "tags": ["electronics"]}'

# Search
curl "localhost:9200/products/_search?q=widget"

# OpenSearch Dashboards (Kibana alternative)
docker run -d --name dashboards \
  -p 5601:5601 \
  -e OPENSEARCH_HOSTS=http://opensearch:9200 \
  opensearchproject/opensearch-dashboards:latest
```

## Introduction
OpenSearch was created by AWS in 2021 when Elastic changed Elasticsearch from Apache-2.0 to a non-open-source license. Forked from Elasticsearch 7.10.2, OpenSearch provides the same core search and analytics capabilities with a commitment to true open-source licensing (Apache-2.0).

With over 13,000 GitHub stars and backed by AWS, OpenSearch has grown beyond a fork — it now includes unique features like neural search, conversational search, and observability tools not found in the original Elasticsearch.

## What OpenSearch Does
OpenSearch indexes and searches structured and unstructured data at scale. It is wire-compatible with Elasticsearch 7.x, meaning existing Elasticsearch clients, tools, and integrations work with OpenSearch. The suite includes OpenSearch (search engine) and OpenSearch Dashboards (visualization, equivalent to Kibana).

## Architecture Overview
```
[OpenSearch Suite]
        |
+-------+-------+
|               |
[OpenSearch]    [OpenSearch Dashboards]
Search engine   Visualization & UI
(Elasticsearch  (Kibana fork)
fork)           Alerting, Notebooks
        |
   [Plugins (built-in)]
   Security (free!)
   Alerting
   Anomaly Detection
   SQL/PPL queries
   Neural Search (AI)
   Observability
   Index Management
        |
   [Compatible with]
   Logstash, Fluentd,
   Beats, Data Prepper
```

## Self-Hosting & Configuration
```yaml
# docker-compose.yml
version: "3.8"
services:
  opensearch:
    image: opensearchproject/opensearch:2.15.0
    environment:
      - cluster.name=my-cluster
      - discovery.type=single-node
      - bootstrap.memory_lock=true
      - "OPENSEARCH_JAVA_OPTS=-Xms2g -Xmx2g"
    ulimits:
      memlock: { soft: -1, hard: -1 }
    ports:
      - 9200:9200
    volumes:
      - os-data:/usr/share/opensearch/data

  dashboards:
    image: opensearchproject/opensearch-dashboards:2.15.0
    ports:
      - 5601:5601
    environment:
      OPENSEARCH_HOSTS: "[\"https://opensearch:9200\"]"

volumes:
  os-data:
```

## Key Features
- **Apache-2.0 License** — truly open source with no feature gates
- **Security Built-in** — free authentication, RBAC, encryption, and audit logs
- **Neural Search** — AI-powered semantic search using ML models
- **SQL/PPL** — query with SQL or Piped Processing Language
- **Alerting** — built-in alerting with notifications (Slack, email, webhook)
- **Anomaly Detection** — ML-powered anomaly detection on time-series data
- **Observability** — trace analytics, log correlation, and metrics
- **Elasticsearch Compatible** — works with existing ES 7.x clients

## Comparison with Similar Tools
| Feature | OpenSearch | Elasticsearch | Meilisearch | Typesense |
|---|---|---|---|---|
| License | Apache-2.0 | SSPL/Elastic | MIT | GPL-3.0 |
| Security (free) | Yes | Paid | Basic | Basic |
| Alerting (free) | Yes | Paid | No | No |
| ML/AI Search | Neural search | Paid | AI-powered | Semantic |
| Scale | Petabytes | Petabytes | Single-node | Cluster |
| AWS Managed | Amazon OpenSearch | Elastic Cloud | Cloud | Cloud |
| Best For | OSS enterprise search | Latest features | Simple apps | Simple apps |

## FAQ
**Q: Can I migrate from Elasticsearch to OpenSearch?**
A: Yes. OpenSearch is wire-compatible with Elasticsearch 7.x. Most clients, tools, and dashboards work with minimal changes. AWS provides migration documentation.

**Q: Is OpenSearch just an Elasticsearch fork?**
A: It started as a fork but has diverged significantly. OpenSearch has added neural search, conversational search, flow framework, and other features not in Elasticsearch.

**Q: Why is OpenSearch free security important?**
A: Elasticsearch requires a paid license for basic security (authentication, encryption). OpenSearch includes comprehensive security for free — critical for production deployments.

**Q: Should I choose OpenSearch or Elasticsearch?**
A: OpenSearch for true open-source licensing, free security features, and AWS integration. Elasticsearch for the latest search innovations and Elastic Cloud ecosystem.

## Sources
- GitHub: https://github.com/opensearch-project/OpenSearch
- Documentation: https://opensearch.org/docs
- Created by AWS, community-maintained
- License: Apache-2.0

---
Source: https://tokrepo.com/en/workflows/8d537661-3734-11f1-9bc6-00163e2b0d79
Author: AI Open Source