Add tenant_subdomain documentation

Author: nicklas-dohrn

cf-java-logging-support-core/beats/app-logs/docs/fields.asciidoc

@@ -100,6 +100,15 @@ required: False
 A unique identifier that can be used to correlate multiple messages to a tenant.
 
 
+==== tenant_subdomain
+
+example: e24a5963-95eb-4568-b1ae-81b67c41e99a
+
+required: False
+
+A field adding the possibility to add the specific tenant subdmain of the xsuaa.
+
+
 ==== component_id
 
 type: string

cf-java-logging-support-core/beats/app-logs/etc/app-logs.template.json

@@ -113,6 +113,11 @@
           "index": "not_analyzed",
           "type": "string"
         },
+        "tenant_subdomain": {
+          "doc_values": true,
+          "index": "not_analyzed",
+          "type": "string"
+        },
         "thread": {
           "doc_values": true,
           "index": "not_analyzed",

cf-java-logging-support-core/beats/app-logs/etc/fields.yml

@@ -83,6 +83,13 @@ ctx:
       description: |
         A unique identifier that can be used to correlate multiple messages to a tenant.
 
+    - name: "tenant_subdomain"
+      string: string
+      required: false
+      example: "e24a5963-95eb-4568-b1ae-81b67c41e99a"
+      description: |
+        A field adding the possibility to add the specific tenant subdmain of the xsuaa.
+
     - name: "component_id"
       type: string
       required: true