update README

Author: light4

README.md

@@ -72,7 +72,6 @@ The Elasticsearch MCP Server supports configuration options to connect to your E
 |---------------------|-------------|----------|
 | `SSE_ADDR` | Enable SSE and set the ADDR | No |
 | `ES_URL` | Your Elasticsearch instance URL | Yes |
-| `ES_URL` | Your Elasticsearch instance URL | Yes |
 | `ES_API_KEY` | Elasticsearch API key for authentication | No |
 | `ES_USERNAME` | Elasticsearch username for basic authentication | No |
 | `ES_PASSWORD` | Elasticsearch password for basic authentication | No |