update runner on merge

.gitea/workflows/update_opensearch_filters.yaml

@@ -1,12 +1,15 @@
 name: Updates Opensearch filters
 
 on:
-    pull_request:
+  pull_request:
-        branches:
+    types:
-            - main
+      - closed
+    branches:
+      - main
 
 jobs:
     update-opensearch-filters:
+        if: github.event.pull_request.merged == true
         runs-on: ubuntu
 
         steps:
@@ -23,8 +26,7 @@ jobs:
                   python -m pip install --upgrade pip
                   pip install . -r tools-requirements.txt
 
-            - name: get git info
+            - name: Update swiss and eu_de Opensearch indizies             
-             
               run: |
                   python tools/index_metadata.py --hosts ${{ secrets.OPENSEARCH_HOST1 }} --target-environment public --index search_index_de --cloud-environment eu_de --username ${{ secrets.OPENSEARCH_USER }} --password ${{ secrets.OPENSEARCH_PW }} --delete-index
                   python tools/index_metadata.py --hosts ${{ secrets.OPENSEARCH_HOST1 }} --target-environment public --index search_index_swiss --cloud-environment swiss --username ${{ secrets.OPENSEARCH_USER }} --password ${{ secrets.OPENSEARCH_PW }} --delete-index