docs: Update api_key example on elasticsearch output (#28606)

ugosan · mergify-bot · commit e231e22d5160 · 2021-10-25T19:02:14.000Z
(cherry picked from commit 54dcfd2)
diff --git a/libbeat/docs/https.asciidoc b/libbeat/docs/https.asciidoc
@@ -54,7 +54,7 @@ For example:
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 output.elasticsearch:
   hosts: ["https://myEShost:9200"]
-  api_key: "KnR6yE41RrSowb0kQ0HWoA" <1>
+  api_key: "ZCV7VnwBgnX0T19fN8Qe:KnR6yE41RrSowb0kQ0HWoA" <1>
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 <1> This API key must have the privileges required to publish events to {es}.
 To create an API key like this, see <<beats-api-keys>>.
