@Override
  public void put(Object indexKey, Object regionKey, Object value) {
    map.put(new Pair(toDeserializable(indexKey), toDeserializable(regionKey)),
        toDeserializable(value));

  }
A dummy implementation of an IndexMap. Keeps all of the entries in memory, but in serialized
form.
geode-core/src/main/java/org/apache/geode/internal/cache/persistence/query/mock/IndexMapImpl.java