Address PR comments

Signed-off-by: mgodwan <[email protected]>

server/src/main/java/org/opensearch/index/codec/fuzzy/IndexInputImmutableLongArray.java

@@ -40,6 +40,8 @@ public long size() {
     @Override
     public synchronized long get(long index) {
         try {
+            // Multiplying by 8 since each long is 8 bytes, and we need to get the long value at (index * 8) in the
+            // RandomAccessInput being accessed.
             return input.readLong(index << 3);
         } catch (IOException ex) {
             throw new OpenSearchException(ex);

server/src/main/java/org/opensearch/index/codec/fuzzy/LongArrayBackedBitSet.java

@@ -43,7 +43,8 @@ class LongArrayBackedBitSet implements Accountable, Closeable {
      */
     LongArrayBackedBitSet(IndexInput in) throws IOException {
         underlyingArrayLength = in.readLong();
-        // Multiplying by 8 since this
+        // Multiplying by 8 since the length above is of the long array, so we will have
+        // 8 times the number of bytes in our stream.
         long streamLength = underlyingArrayLength << 3;
         this.longArray = new IndexInputImmutableLongArray(underlyingArrayLength, in.randomAccessSlice(in.getFilePointer(), streamLength));
         in.skipBytes(streamLength);