Remove MavenFilteringHack (#73637) (#75550)

Co-authored-by: Jake Landis <jake.landis@elastic.co>

qa/smoke-test-plugins/build.gradle

@@ -6,8 +6,7 @@
  * Side Public License, v 1.
  */
 
-
-import org.elasticsearch.gradle.internal.MavenFilteringHack
+import org.apache.tools.ant.filters.ReplaceTokens
 import org.elasticsearch.gradle.internal.info.BuildParams
 
 apply plugin: 'elasticsearch.internal-testclusters'
@@ -38,5 +37,5 @@ ext.expansions = [
 tasks.named("processTestResources").configure {
   assert pluginPaths.size() > 0
   inputs.properties(expansions)
-  MavenFilteringHack.filter(it, expansions)
+  filter("tokens" : expansions.collectEntries {k, v -> [k, v.toString()]} /* must be a map of strings */, ReplaceTokens.class)
 }

qa/smoke-test-plugins/src/test/resources/rest-api-spec/test/smoke_test_plugins/10_basic.yml

@@ -10,4 +10,4 @@
     - do:
         nodes.info: {}
 
-    - length:  { nodes.$master.plugins: ${expected.plugins.count}  }
+    - length: { nodes.$master.plugins: @expected.plugins.count@ }