# Elasticsearch & OpenSearch MCP Server (elasticsearch-mcp-server) - AgentBreakWatch Reference

> TL;DR Verdict: Elasticsearch & OpenSearch MCP Server (`elasticsearch-mcp-server`) is currently at v2.1.6 on PYPI (published 2026-10-19), with a 90-day Stability Score of 86/100 (B+) and MEDIUM schema drift risk across 4 releases in the last 90 days. Requires FastMCP / MCP Python SDK v2+ tool schema validation; unpinned uvx elasticsearch-mcp-server@latest deployments risk parameter drift across list_indices and get_mappings.

## Live Telemetry Metadata
- Canonical Page: https://agentbreakwatch.vercel.app/p/elasticsearch-mcp-pypi
- Category Hub: https://agentbreakwatch.vercel.app/c/database-backend (Database, SQL & Vector DB MCP Servers Stability Index)
- Package Name: `elasticsearch-mcp-server`
- Registry: PYPI (https://pypi.org/project/elasticsearch-mcp-server/)
- GitHub Repository: https://github.com/elastic/mcp-server-elasticsearch
- Vendor: Elastic
- Latest Live Version: v2.1.6
- Published Date: 2026-10-19T15:14:33.066027Z
- 90-Day Release Count: 4
- Direct Dependencies: 10
- License: Apache License Version 2
- Stability Score: 86/100 (Grade B+)
- Schema Drift Risk: MEDIUM
- Recommended Exact Pin Command: `uvx elasticsearch-mcp-server@2.1.6`
- Watched Symbols / MCP Tools: list_indices, get_mappings, search, esql
- Snapshot Timestamp: 2026-10-24T12:11:27.697Z

## Breaking Change & Schema Drift Summary
Requires FastMCP / MCP Python SDK v2+ tool schema validation; unpinned uvx elasticsearch-mcp-server@latest deployments risk parameter drift across list_indices and get_mappings.

## Migration Diff: Before (Deprecated / Unpinned Pattern)
```
"elasticsearch-mcp-pypi": {
  "command": "uvx",
  "args": ["elasticsearch-mcp-server"]
}
```

## Migration Diff: After (Verified v2.1.6 Pattern)
```
"elasticsearch-mcp-pypi": {
  "command": "uvx",
  "args": ["elasticsearch-mcp-server@2.1.6"],
  "env": { "FASTMCP_LOG_LEVEL": "ERROR" }
}
```

## Recent Verified Releases
- v2.1.6 (published 2026-10-19) [LATEST]
- v2.1.5 (published 2026-10-13)
- v2.1.4 (published 2026-10-02)
- v2.1.3 (published 2026-08-16)
- v2.1.2 (published 2026-05-22)
- v2.1.1 (published 2026-05-06)