[libbeat]add EC2 fields to yaml for add_cloud_metadata (elastic#12335)

* add EC2 fields to yaml for add_cloud_metadata
DStape · May 31, 2019 · 3eeb9d8 · 3eeb9d8
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diff --git a/docs/fields.asciidoc b/docs/fields.asciidoc
@@ -117,6 +117,16 @@ example: project-x
 Name of the project in Google Cloud.
 
 
+--
+
+*`cloud.image.id`*::
++
+--
+example: ami-abcd1234
+
+Image ID for the cloud instance.
+
+
 --
 
 *`meta.cloud.provider`*::