[es] add ssl-show-warn setting for cnx

cubicweb_elasticsearch/es.py

@@ -157,6 +157,7 @@ def get_connection(config):
             es = connections.create_connection(
                 hosts=locations.split(","),
                 verify_certs=config["elasticsearch-verify-certs"],
+                ssl_show_warn=config["elasticsearch-ssl-show-warn"],
                 timeout=20,
             )
             return es

cubicweb_elasticsearch/site_cubicweb.py

@@ -34,4 +34,15 @@ options = (
             "level": 5,
         },
     ),
+    (
+        "elasticsearch-ssl-show-warn",
+        {
+            "type": "yn",
+            "default": True,
+            "help": "Elastic Search connection ssl-show-warn variable"
+            "(set to no if you want to suppress ssl warnings when verify cert is no",
+            "group": "elasticsearch",
+            "level": 5,
+        },
+    ),
 )