Adding check if the document has returned in the yaml test

Author: Samiul-TheSoccerFan

x-pack/plugin/inference/src/yamlRestTest/resources/rest-api-spec/test/inference/30_semantic_text_inference_bwc.yml

@@ -673,4 +673,5 @@ setup:
           query:
             match_all: { }
 
+  - match: { hits.total.value: 1 }
   - not_exists: hits.hits.0._source._inference_fields