Change username for cm:owner cm:creator cm:modifier in Alfresco Javascript Console

gistfile1.js

var ctx = Packages.org.springframework.web.context.ContextLoader.getCurrentWebApplicationContext();
var behaviourFilter = ctx.getBean("policyBehaviourFilter");

// -----------------------------------------------------------------

function findAndReplaceAttribute(query, attribute, value) {
  nodes = search.luceneSearch(query);
  
  for each(var node in nodes) {
      logger.log("Changing property "+attribute+" from value '"+ node.properties[attribute]+"' of node " + node.nodeRef + " to value '"+value+"'");
      behaviourFilter.disableBehaviour(node.nodeRef);
      node.properties[attribute] = value;
      node.save();
  }
}

// -----------------------------------------------------------------

var oldUser = "oldusername", newUser = "newusername";

findAndReplaceAttribute("+@cm\\:modifier:" + oldUser, "cm:modifier", newUser);
findAndReplaceAttribute("+@cm\\:creator:"  + oldUser, "cm:creator",  newUser);
findAndReplaceAttribute("+@cm\\:owner:"    + oldUser, "cm:owner",    newUser);

This should work on Alfresco 5.x:

var ctx = Packages.org.springframework.web.context.ContextLoader.getCurrentWebApplicationContext();
var cls = org.alfresco.repo.policy.BehaviourFilterImpl;

var behaviourFilters = ctx.getBeansOfType(cls);
var filter = null;
for (var i in behaviourFilters) {
	if (i === "policyBehaviourFilter") {
		filter = behaviourFilters[i];;
		break;
	}
}

print(filter);