fix yaml test

Author: rubvs

x-pack/plugin/apm-data/src/yamlRestTest/resources/rest-api-spec/test/20_traces_ingest.yml

@@ -120,7 +120,7 @@ setup:
         index: traces-apm-testing
         body:
           fields: ["event.success_count"]
-  - length: { hits.hits: 5 }
+  - length: { hits.hits: 7 }
   - match: { hits.hits.0.fields: null }
   - match: { hits.hits.1.fields: null }
   - match: { hits.hits.2.fields: {"event.success_count": [2]} }