code: private void insertIntoTableKToV(int entry, int keyHash) {
      checkArgument(entry != ABSENT);
      int keyBucket = bucket(keyHash);
      nextInBucketKToV[entry] = hashTableKToV[keyBucket];
      hashTableKToV[keyBucket] = entry;
    }
docs: Updates the K-to-V hash table to include the entry at the specified index, which is assumed to
  have not yet been added.