docs: private static final int findEmpty(final byte[] key, final int tableEntries, final byte[] stateArr) {
      final long[] hash = MurmurHash3.hash(key, SEED);
      int entryIndex  = getIndex(hash[0], tableEntries);
      final int stride = getStride(hash[1], tableEntries);
      final int loopIndex = entryIndex;
  
      do {
        if (isBitClear(stateArr, entryIndex)) { //check if slot is empty
          return entryIndex;
        }
        entryIndex = (entryIndex + stride) % tableEntries;
      } while (entryIndex != loopIndex);
      throw new SketchesArgumentException("No empty slots.");
    }