Fix RestChatAgentIT teardown failure when AWS credentials are absent (#4772) (#4773)

The @after deleteIndices() method runs unconditionally, even when
setup() skips via Assume.assumeNotNull due to missing AWS credentials.
Since iris_data was never created, the DELETE returns 404, which
combines with the AssumptionViolatedException to produce a
TestCouldNotBeSkippedException — turning a skip into a hard failure.

Guard the teardown with the same credential check used in setup().


(cherry picked from commit 9df8682)

Signed-off-by: Tyler Ohlsen <ohltyler@amazon.com>
Co-authored-by: Tyler Ohlsen <ohltyler@amazon.com>

Author: opensearch-trigger-bot[bot]

plugin/src/test/java/org/opensearch/ml/rest/RestChatAgentIT.java

@@ -65,7 +65,9 @@ public void setup() throws IOException, ParseException, InterruptedException {
 
     @After
     public void deleteIndices() throws IOException {
-        deleteIndexWithAdminClient(irisIndex);
+        if (AWS_ACCESS_KEY_ID != null && AWS_SECRET_ACCESS_KEY != null) {
+            deleteIndexWithAdminClient(irisIndex);
+        }
     }
 
     public void testChatAgentWithAgentTool() throws IOException {