Propagate the flush IOContext to stored fields / term vectors writers…

… when index sorting is enabled. (#13265)

This fixes index sorting to pass the correct `IOContext` to stored fields and
term vectors writers when index sorting is enabled. This is important for
things like `NRTCachingDirectory`.

lucene/core/src/java/org/apache/lucene/index/SortingStoredFieldsConsumer.java

@@ -101,9 +101,7 @@ void flush(SegmentWriteState state, Sorter.DocMap sortMap) throws IOException {
     // Don't pull a merge instance, since merge instances optimize for
     // sequential access while we consume stored fields in random order here.
     StoredFieldsWriter sortWriter =
-        codec
-            .storedFieldsFormat()
-            .fieldsWriter(state.directory, state.segmentInfo, IOContext.DEFAULT);
+        codec.storedFieldsFormat().fieldsWriter(state.directory, state.segmentInfo, state.context);
     try {
       reader.checkIntegrity();
       CopyVisitor visitor = new CopyVisitor(sortWriter);

lucene/core/src/java/org/apache/lucene/index/SortingTermVectorsConsumer.java

@@ -68,7 +68,7 @@ void flush(
       TermVectorsWriter writer =
           codec
               .termVectorsFormat()
-              .vectorsWriter(state.directory, state.segmentInfo, IOContext.DEFAULT);
+              .vectorsWriter(state.directory, state.segmentInfo, state.context);
       try {
         reader.checkIntegrity();
         for (int docID = 0; docID < state.segmentInfo.maxDoc(); docID++) {