Add a capability

Author: svilen-mihaylov-elastic

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search.highlight/30_max_analyzed_offset.yml

@@ -146,8 +146,12 @@ setup:
 "Plain highlighter with max_analyzed_offset < -1 should FAIL":
 
   - requires:
-      cluster_features: ["gte_v7.12.0"]
-      reason: max_analyzed_offset query param added in 7.12.0
+      test_runner_features: [capabilities]
+      capabilities:
+        - method: GET
+          path: /_search
+          capabilities: [ max_analyzed_offset_default ]
+      reason: Behavior of max_analyzed_offset query param changed in 8.18.
 
   - do:
       catch: bad_request

server/src/main/java/org/elasticsearch/rest/action/search/SearchCapabilities.java

@@ -49,6 +49,8 @@ private SearchCapabilities() {}
     private static final String OPTIMIZED_SCALAR_QUANTIZATION_BBQ = "optimized_scalar_quantization_bbq";
     private static final String KNN_QUANTIZED_VECTOR_RESCORE = "knn_quantized_vector_rescore";
 
+    private static final String MAX_ANALYZED_OFFSET_DEFAULT = "max_analyzed_offset_default";
+
     public static final Set<String> CAPABILITIES;
     static {
         HashSet<String> capabilities = new HashSet<>();
@@ -70,6 +72,7 @@ private SearchCapabilities() {}
         if (Build.current().isSnapshot()) {
             capabilities.add(KQL_QUERY_SUPPORTED);
         }
+        capabilities.add(MAX_ANALYZED_OFFSET_DEFAULT);
         CAPABILITIES = Set.copyOf(capabilities);
     }
 }