Fix indentation in 30_kibana_write.yml

Original commit: elastic/x-pack-elasticsearch@6321493b03

qa/rolling-upgrade/src/test/resources/rest-api-spec/test/mixed_cluster/30_kibana_write.yml

@@ -9,7 +9,7 @@
         timeout: 25s
   - match: { timed_out: false }
 
- - do:
+  - do:
      headers:
        Authorization: "Basic a2liYW5hOmNoYW5nZW1l"
      indices.create:
@@ -20,7 +20,7 @@
            index:
              number_of_replicas: 1
 
- - do:
+  - do:
      headers:
        Authorization: "Basic a2liYW5hOmNoYW5nZW1l"
      bulk:
@@ -37,16 +37,16 @@
          - '{"index": {"_index": ".kibana-foo", "_type": "test_type"}}'
          - '{"f1": "v5_old", "f2": 4}'
 
- - do:
+  - do:
      headers:
        Authorization: "Basic a2liYW5hOmNoYW5nZW1l"
      indices.flush:
         index: .kibana-foo
 
- - do:
+  - do:
      headers:
        Authorization: "Basic a2liYW5hOmNoYW5nZW1l"
      search:
        index: .kibana-foo
 
- - match: { hits.total: 5 }
+  - match: { hits.total: 5 }