Adding API key option to ES config.

Author: rhysrevans3

stac_fastapi/elasticsearch/stac_fastapi/elasticsearch/config.py

@@ -39,6 +39,9 @@ def _es_config() -> Dict[str, Any]:
     if (u := os.getenv("ES_USER")) and (p := os.getenv("ES_PASS")):
         config["http_auth"] = (u, p)
 
+    if api_key := os.getenv("ES_API_KEY"):
+        config["headers"]["x-api-key"] = api_key
+
     return config