fix yaml tests

Author: mromaios

x-pack/plugin/inference/src/yamlRestTest/resources/rest-api-spec/test/inference/90_semantic_text_highlighter.yml

@@ -710,7 +710,7 @@ setup:
   - match: { hits.hits.0.highlight.body.0: "ElasticSearch is an open source, distributed, RESTful, search engine which is built on top of Lucene internally and enjoys all the features it provides." }
 
   - match: { hits.hits.1._id: "doc_2" }
-  - length: { hits.hits.1.highlight: 2 }
+  - length: { hits.hits.1.highlight: 1 }
   - length: { hits.hits.1.highlight.body: 1 }
   - match: { hits.hits.1.highlight.body.0: "Nothing travels faster than the speed of light with the possible exception of bad news, which obeys its own special laws." }
 

x-pack/plugin/inference/src/yamlRestTest/resources/rest-api-spec/test/inference/90_semantic_text_highlighter_bwc.yml

@@ -689,7 +689,7 @@ setup:
   - match: { hits.hits.0.highlight.body.0: "ElasticSearch is an open source, distributed, RESTful, search engine which is built on top of Lucene internally and enjoys all the features it provides." }
 
   - match: { hits.hits.1._id: "doc_2" }
-  - length: { hits.hits.1.highlight: 2 }
+  - length: { hits.hits.1.highlight: 1 }
   - length: { hits.hits.1.highlight.body: 1 }
   - match: { hits.hits.1.highlight.body.0: "Nothing travels faster than the speed of light with the possible exception of bad news, which obeys its own special laws." }