Remove code for ?verbose in _segments API (#116030)

A change made in 8.0 intended to deprecate this parameter. However,
because the new code only checked for the presence of the parameter
and never consumed it, the effect was actually to remove support for
the parameter. This code therefore basically does nothing and can be
removed.

Author: PeteGillinElastic

rest-api-spec/src/main/resources/rest-api-spec/api/indices.segments.json

@@ -51,15 +51,6 @@
         ],
         "default":"open",
         "description":"Whether to expand wildcard expression to concrete indices that are open, closed or both."
-      },
-      "verbose":{
-        "type":"boolean",
-        "description":"Includes detailed memory usage by Lucene.",
-        "default":false,
-        "deprecated" : {
-          "version" : "8.0.0",
-          "description" : "lucene no longer keeps track of segment memory overhead as it is largely off-heap"
-        }
       }
     }
   }

server/src/main/java/org/elasticsearch/rest/action/admin/indices/RestIndicesSegmentsAction.java

@@ -13,8 +13,6 @@
 import org.elasticsearch.action.support.IndicesOptions;
 import org.elasticsearch.client.internal.node.NodeClient;
 import org.elasticsearch.common.Strings;
-import org.elasticsearch.common.logging.DeprecationCategory;
-import org.elasticsearch.common.logging.DeprecationLogger;
 import org.elasticsearch.rest.BaseRestHandler;
 import org.elasticsearch.rest.RestRequest;
 import org.elasticsearch.rest.Scope;
@@ -30,8 +28,6 @@
 @ServerlessScope(Scope.INTERNAL)
 public class RestIndicesSegmentsAction extends BaseRestHandler {
 
-    private static final DeprecationLogger DEPRECATION_LOGGER = DeprecationLogger.getLogger(RestIndicesSegmentsAction.class);
-
     public RestIndicesSegmentsAction() {}
 
     @Override
@@ -49,13 +45,6 @@ public RestChannelConsumer prepareRequest(final RestRequest request, final NodeC
         IndicesSegmentsRequest indicesSegmentsRequest = new IndicesSegmentsRequest(
             Strings.splitStringByCommaToArray(request.param("index"))
         ).withVectorFormatsInfo(request.paramAsBoolean("vector_formats", false));
-        if (request.hasParam("verbose")) {
-            DEPRECATION_LOGGER.warn(
-                DeprecationCategory.INDICES,
-                "indices_segments_action_verbose",
-                "The [verbose] query parameter for [indices_segments_action] has no effect and is deprecated"
-            );
-        }
         indicesSegmentsRequest.indicesOptions(IndicesOptions.fromRequest(request, indicesSegmentsRequest.indicesOptions()));
         return channel -> new RestCancellableNodeClient(client, request.getHttpChannel()).admin()
             .indices()