import com.mongodb.*;
import org.apache.jmeter.protocol.mongodb.config.MongoDBHolder
import java.util.concurrent.ThreadLocalRandom;

int randomNumber = ThreadLocalRandom.current().nextInt(1, 50000001);

DB db = MongoDBHolder.getDBFromSource(„whatever“, „inka“);
DBCollection collection = db.getCollection(„profiles“);

BasicDBObject query = new BasicDBObject(„_id“, randomNumber);
DBObject result = collection.findOne(query);

SampleResult.setResponseData(result.toString().getBytes());