Only run DirectIOIT with the feature flag (#138175)

Author: thecoop

muted-tests.yml

@@ -450,12 +450,6 @@ tests:
 - class: org.elasticsearch.xpack.inference.integration.AuthorizationTaskExecutorMultipleNodesIT
   method: testCancellingAuthorizationTaskRestartsIt
   issue: https://github.com/elastic/elasticsearch/issues/138099
-- class: org.elasticsearch.index.store.DirectIOIT
-  method: testDirectIONotUsed {p0=bbq_disk}
-  issue: https://github.com/elastic/elasticsearch/issues/138102
-- class: org.elasticsearch.index.store.DirectIOIT
-  method: testDirectIOUsed {p0=bbq_disk}
-  issue: https://github.com/elastic/elasticsearch/issues/138104
 - class: org.elasticsearch.xpack.shutdown.NodeShutdownIT
   method: testStalledShardMigrationProperlyDetected
   issue: https://github.com/elastic/elasticsearch/issues/115697
@@ -477,12 +471,6 @@ tests:
 - class: org.elasticsearch.xpack.downsample.DataStreamLifecycleDownsampleIT
   method: testUpdateDownsampleSamplingMode
   issue: https://github.com/elastic/elasticsearch/issues/138135
-- class: org.elasticsearch.index.store.DirectIOIT
-  method: testDirectIONotUsed {p0=bbq_hnsw}
-  issue: https://github.com/elastic/elasticsearch/issues/138101
-- class: org.elasticsearch.index.store.DirectIOIT
-  method: testDirectIOUsed {p0=bbq_hnsw}
-  issue: https://github.com/elastic/elasticsearch/issues/138103
 
 # Examples:
 #

server/src/internalClusterTest/java/org/elasticsearch/index/store/DirectIOIT.java

@@ -20,6 +20,7 @@
 import org.apache.lucene.tests.util.LuceneTestCase;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.core.Strings;
+import org.elasticsearch.index.codec.vectors.es93.ES93GenericFlatVectorsFormat;
 import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.search.vectors.KnnSearchBuilder;
 import org.elasticsearch.search.vectors.VectorData;
@@ -58,6 +59,8 @@ public static void checkSupported() {
         } catch (IOException e) {
             SUPPORTED = false;
         }
+
+        assumeTrue("Generic format supporting direct IO not enabled", ES93GenericFlatVectorsFormat.GENERIC_VECTOR_FORMAT.isEnabled());
     }
 
     static DirectIODirectory open(Path path) throws IOException {