Connection getConnection() {
    Connection result = connection;
    if (result == null) {
      throw new ConnectionDestroyedException();
    }
    return result;
  }
When a pooled connection is destroyed, it's not destroyed right away, but when it is returned
to the pool.
geode-core/src/main/java/org/apache/geode/cache/client/internal/pooling/PooledConnection.java