@Override
  public boolean containsValueForKey(Object key) {
    recordTXOperation(ServerRegionOperation.CONTAINS_VALUE_FOR_KEY, key);
    return ContainsKeyOp.execute(pool, regionName, key, MODE.VALUE_FOR_KEY);
  }
Does a region clear on the server using the given connection.

@param con the connection to use to send to the server
@param eventId the event id for this clear
@param callbackArg an optional callback arg to pass to any cache callbacks
geode-core/src/main/java/org/apache/geode/cache/client/internal/ServerRegionProxy.java