Add minTranslogGeneration to remote translog metadata filename (opensearch-project#15489)

Signed-off-by: Sachin Kale <kalsac@amazon.com>
Co-authored-by: Sachin Kale <kalsac@amazon.com>

Author: sachinpkale

server/src/main/java/org/opensearch/index/translog/transfer/TranslogTransferMetadata.java

@@ -101,6 +101,7 @@ public String getFileName() {
                 RemoteStoreUtils.invertLong(generation),
                 RemoteStoreUtils.invertLong(createdAt),
                 String.valueOf(Objects.hash(nodeId)),
+                RemoteStoreUtils.invertLong(minTranslogGeneration),
                 String.valueOf(CURRENT_VERSION)
             )
         );

server/src/test/java/org/opensearch/index/translog/transfer/TranslogTransferManagerTests.java

@@ -623,7 +623,7 @@ public void testMetadataConflict() throws InterruptedException {
         String mdFilename = tm.getFileName();
         long count = mdFilename.chars().filter(ch -> ch == METADATA_SEPARATOR.charAt(0)).count();
         // There should not be any `_` in mdFile name as it is used a separator .
-        assertEquals(10, count);
+        assertEquals(12, count);
         Thread.sleep(1);
         TranslogTransferMetadata tm2 = new TranslogTransferMetadata(1, 1, 1, 2, "node--2");
         String mdFilename2 = tm2.getFileName();