Make Recovery API support `detailed` params (#29076)

Properly forwards the `detailed` parameter to show the recovery stats details.

Closes #28910

docs/reference/indices/recovery.asciidoc

@@ -249,7 +249,7 @@ Response:
 }
 --------------------------------------------------
 // TESTRESPONSE[s/"source" : \{[^}]*\}/"source" : $body.$_path/]
-// TESTRESPONSE[s/"details" : \[[^\]]*\]//]
+// TESTRESPONSE[s/"details" : \[[^\]]*\]/"details" : $body.$_path/]
 // TESTRESPONSE[s/: (\-)?[0-9]+/: $body.$_path/]
 // TESTRESPONSE[s/: "[^"]*"/: $body.$_path/]
 ////

rest-api-spec/src/main/resources/rest-api-spec/test/indices.recovery/10_basic.yml

@@ -130,3 +130,28 @@
         index: [v*]
 
   - match: { $body: {} }
+---
+"Indices recovery test with detailed parameter":
+  - skip:
+      version: " - 7.2.99"
+      reason: bug with detailed parameter fixed in 7.3
+
+  - do:
+      indices.create:
+        index:  test_3
+        body:
+          settings:
+            index:
+              number_of_replicas: 0
+
+  - do:
+      cluster.health:
+        wait_for_status: green
+
+  - do:
+      indices.recovery:
+        index: [test_3]
+        human: true
+        detailed: true
+
+  - match: { test_3.shards.0.index.files.details: [] }

server/src/main/java/org/elasticsearch/indices/recovery/RecoveryState.java

@@ -929,7 +929,7 @@ public class RecoveryState implements ToXContentFragment, Streamable, Writeable
             builder.field(Fields.REUSED, reusedFileCount());
             builder.field(Fields.RECOVERED, recoveredFileCount());
             builder.field(Fields.PERCENT, String.format(Locale.ROOT, "%1.1f%%", recoveredFilesPercent()));
-            if (params.paramAsBoolean("details", false)) {
+            if (params.paramAsBoolean("detailed", false)) {
                 builder.startArray(Fields.DETAILS);
                 for (File file : fileDetails.values()) {
                     file.toXContent(builder, params);