Explicitly cleanup test index with shared data path (elastic#136048)

This commit adds explicit cleanup of a test index using a shared data
path. Otherwise the rest test infra tries to clean it up, which checks
the data_path setting, and emits a warning which fails the test.

closes elastic#132223

Author: rjernst

muted-tests.yml

@@ -211,9 +211,6 @@ tests:
 - class: org.elasticsearch.xpack.restart.FullClusterRestartIT
   method: testWatcherWithApiKey {cluster=UPGRADED}
   issue: https://github.com/elastic/elasticsearch/issues/131964
-- class: org.elasticsearch.test.rest.yaml.MDPYamlTestSuiteIT
-  method: test {yaml=mdp/10_basic/Index using shared data path}
-  issue: https://github.com/elastic/elasticsearch/issues/132223
 - class: org.elasticsearch.xpack.sql.qa.mixed_node.SqlCompatIT
   method: testNullsOrderWithMissingOrderSupportQueryingNewNode
   issue: https://github.com/elastic/elasticsearch/issues/132249

qa/multi-data-path/src/yamlRestTest/resources/rest-api-spec/test/mdp/10_basic.yml

@@ -2,7 +2,7 @@
 "Index using shared data path":
 
   - requires:
-      test_runner_features: ["warnings"]
+      test_runner_features: ["warnings", "allowed_warnings"]
 
   - do:
       warnings:
@@ -29,3 +29,9 @@
         op_type:  index
 
   - match:   { result: updated }
+
+  - do:
+      allowed_warnings:
+        - "[index.data_path] setting was deprecated in Elasticsearch and will be removed in a future release. See the deprecation documentation for the next major version."
+      indices.delete:
+        index: test_index