Elasticsearch: Fix handling of inline scripts in different ES versions (#34070)

* Devenv: add block for es 5.0, provisioned datasource & dashboard

* Trasnsform script property based on running ES version

* Handle different scripts format in BE

devenv/datasources.yaml

@@ -124,6 +124,26 @@ datasources:
       timeField: "@timestamp"
       esVersion: 5
 
+  - name: gdev-elasticsearch-v56-metrics
+    type: elasticsearch
+    access: proxy
+    database: "[metrics-]YYYY.MM.DD"
+    url: http://localhost:13200
+    jsonData:
+      interval: Daily
+      timeField: "@timestamp"
+      esVersion: 56
+
+  - name: gdev-elasticsearch-v56-logs
+    type: elasticsearch
+    access: proxy
+    database: "[logs-]YYYY.MM.DD"
+    url: http://localhost:13200
+    jsonData:
+      interval: Daily
+      timeField: "@timestamp"
+      esVersion: 56
+
   - name: gdev-elasticsearch-v6-metrics
     type: elasticsearch
     access: proxy