Update elasticsearch.yaml (#20388)

`target_type` seems to be there by accident. It also has conflicting content with `targetType`

Author: PSeitz-dd

elastic/assets/logs/elasticsearch.yaml

@@ -79,7 +79,6 @@ pipeline:
       sources:
         - nodeId
       target: node_name
-      target_type: tag
       preserveSource: true
       overrideOnConflict: false
       sourceType: attribute