Use adminClient when deleting ISM index in RestStopRollupActionIT

Signed-off-by: Craig Perkins <cwperx@amazon.com>

src/test/kotlin/org/opensearch/indexmanagement/rollup/resthandler/RestStopRollupActionIT.kt

@@ -5,11 +5,13 @@
 
 package org.opensearch.indexmanagement.rollup.resthandler
 
+import org.opensearch.client.Request
 import org.opensearch.client.ResponseException
 import org.opensearch.common.settings.Settings
 import org.opensearch.core.rest.RestStatus
 import org.opensearch.indexmanagement.IndexManagementIndices
 import org.opensearch.indexmanagement.IndexManagementPlugin
+import org.opensearch.indexmanagement.IndexManagementPlugin.Companion.INDEX_MANAGEMENT_INDEX
 import org.opensearch.indexmanagement.IndexManagementPlugin.Companion.ROLLUP_JOBS_BASE_URI
 import org.opensearch.indexmanagement.common.model.dimension.DateHistogram
 import org.opensearch.indexmanagement.common.model.dimension.Terms
@@ -256,7 +258,8 @@ class RestStopRollupActionIT : RollupRestAPITestCase() {
 
     fun `test stop rollup when multiple shards configured for IM config index`() {
         // setup ism-config index with multiple primary shards
-        deleteIndex(IndexManagementPlugin.INDEX_MANAGEMENT_INDEX)
+        val deleteISMIndexRequest = Request("DELETE", "/$INDEX_MANAGEMENT_INDEX")
+        adminClient().performRequest(deleteISMIndexRequest)
         val mapping = IndexManagementIndices.indexManagementMappings.trim().trimStart('{').trimEnd('}')
         val settings =
             Settings.builder()
@@ -313,7 +316,7 @@ class RestStopRollupActionIT : RollupRestAPITestCase() {
 
         // clearing the config index to prevent other tests using this multi shard index
         Thread.sleep(2000L)
-        deleteIndex(IndexManagementPlugin.INDEX_MANAGEMENT_INDEX)
+        adminClient().performRequest(deleteISMIndexRequest)
         Thread.sleep(2000L)
     }
 }