Update _search query match field in Documentation (#9075) (#9081)

_field-types/supported-field-types/text.md

@@ -122,12 +122,12 @@ GET testindex/_search
 {
   "query": {
     "match": {
-      "text": "date of birth"
+      "dob": "date of birth"
     }
   },
   "highlight": {
     "fields": {
-      "text": {} 
+      "dob": {} 
     }
   }
 }
@@ -170,4 +170,4 @@ The words "date of birth" are highlighted in the response:
     ]
   }
 }
-```
+```