spliting metadata

Reviewed-by: gtema <artem.goncharov@gmail.com>
Co-authored-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-committed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>

otc_metadata/data/documents/ecs-best-practice.yaml

@@ -0,0 +1,9 @@
+---
+environment: internal
+html_location: docs/ecs/best-practice
+link: /elastic-cloud-server/best-practice/
+pdf_name: ecs-best-practice
+rst_location: doc/best-practice/source
+service_type: ecs
+title: Best Practice
+type: best-practice