Remove unused reference to filePermissionsCache (#31923)

Currently Role.Builder keeps a reference to the FieldPermissionsCache that is
passed into its constructors. This seems to be unused except for passing it on
to convertFromIndicesPrivileges() in the second ctor itself, but we don't need
to keep the internal reference in that case, so it can be removed.

Relates to #31876

Author: Christoph Büscher

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/authz/permission/Role.java

@@ -55,11 +55,7 @@ public RunAsPermission runAs() {
     }
 
     public static Builder builder(String... names) {
-        return new Builder(names, null);
-    }
-
-    public static Builder builder(String[] names, FieldPermissionsCache fieldPermissionsCache) {
-        return new Builder(names, fieldPermissionsCache);
+        return new Builder(names);
     }
 
     public static Builder builder(RoleDescriptor rd, FieldPermissionsCache fieldPermissionsCache) {
@@ -94,16 +90,13 @@ public static class Builder {
         private ClusterPermission cluster = ClusterPermission.NONE;
         private RunAsPermission runAs = RunAsPermission.NONE;
         private List<IndicesPermission.Group> groups = new ArrayList<>();
-        private FieldPermissionsCache fieldPermissionsCache = null;
 
-        private Builder(String[] names, FieldPermissionsCache fieldPermissionsCache) {
+        private Builder(String[] names) {
             this.names = names;
-            this.fieldPermissionsCache = fieldPermissionsCache;
         }
 
         private Builder(RoleDescriptor rd, @Nullable FieldPermissionsCache fieldPermissionsCache) {
             this.names = new String[] { rd.getName() };
-            this.fieldPermissionsCache = fieldPermissionsCache;
             if (rd.getClusterPrivileges().length == 0) {
                 cluster = ClusterPermission.NONE;
             } else {

x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/authz/store/CompositeRolesStore.java

@@ -278,7 +278,7 @@ public static Role buildRoleFromDescriptors(Set<RoleDescriptor> roleDescriptors,
 
         final Set<String> clusterPrivs = clusterPrivileges.isEmpty() ? null : clusterPrivileges;
         final Privilege runAsPrivilege = runAs.isEmpty() ? Privilege.NONE : new Privilege(runAs, runAs.toArray(Strings.EMPTY_ARRAY));
-        Role.Builder builder = Role.builder(roleNames.toArray(new String[roleNames.size()]), fieldPermissionsCache)
+        Role.Builder builder = Role.builder(roleNames.toArray(new String[roleNames.size()]))
                 .cluster(ClusterPrivilege.get(clusterPrivs))
                 .runAs(runAsPrivilege);
         indicesPrivilegesMap.entrySet().forEach((entry) -> {