Test: Fix tests looking for old indexes to resolve against the correct dir

core/src/test/java/org/elasticsearch/bwcompat/OldIndexBackwardsCompatibilityIT.java

@@ -165,7 +165,7 @@ public class OldIndexBackwardsCompatibilityIT extends ESIntegTestCase {
         String indexName = indexFile.replace(".zip", "").toLowerCase(Locale.ROOT).replace("unsupported-", "index-");
 
         // decompress the index
-        Path backwardsIndex = getDataPath(indexFile);
+        Path backwardsIndex = getBwcIndicesPath().resolve(indexFile);
         try (InputStream stream = Files.newInputStream(backwardsIndex)) {
             TestUtil.unzip(stream, unzipDir);
         }

core/src/test/java/org/elasticsearch/bwcompat/RecoveryWithUnsupportedIndicesIT.java

@@ -31,7 +31,7 @@ public class RecoveryWithUnsupportedIndicesIT extends StaticIndexBackwardCompati
         String indexName = "unsupported-0.20.6";
 
         logger.info("Checking static index " + indexName);
-        Settings nodeSettings = prepareBackwardsDataDir(getDataPath(indexName + ".zip"), Node.HTTP_ENABLED, true);
+        Settings nodeSettings = prepareBackwardsDataDir(getBwcIndicesPath().resolve(indexName + ".zip"), Node.HTTP_ENABLED, true);
         try {
             internalCluster().startNode(nodeSettings);
             fail();