Fix search on collection in faceted search

****** chain ******
Name: operation
Exception: OperationException
Caught error: Failed to invoke operation Document.PageProvider
Caused by: javax.el.PropertyNotFoundException: Property 'id' not found on type org.nuxeo.ecm.platform.usermanager.NuxeoPrincipalImpl
****** Hierarchy calls ******
	org.nuxeo.ecm.automation.core.operations.services.DocumentPageProviderOperation

	at org.nuxeo.ecm.automation.core.impl.OperationServiceImpl.run(OperationServiceImpl.java:195)
	at org.nuxeo.ecm.automation.core.impl.OperationServiceImpl.run(OperationServiceImpl.java:104)
	at org.nuxeo.ecm.automation.seam.operations.RunOperationInSeam.runChain(RunOperationInSeam.java:90)
	at org.nuxeo.ecm.automation.seam.operations.RunOperationInSeam.run(RunOperationInSeam.java:73)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.nuxeo.ecm.automation.core.impl.InvokableMethod.doInvoke(InvokableMethod.java:135)
	at org.nuxeo.ecm.automation.core.impl.InvokableMethod.invoke(InvokableMethod.java:149)
	at org.nuxeo.ecm.automation.core.impl.CompiledChainImpl.doInvoke(CompiledChainImpl.java:124)
	at org.nuxeo.ecm.automation.core.impl.CompiledChainImpl.invoke(CompiledChainImpl.java:110)
	at org.nuxeo.ecm.automation.core.impl.OperationServiceImpl.run(OperationServiceImpl.java:169)
	... 86 more
Caused by: org.nuxeo.ecm.automation.OperationException: Failed to invoke operation Document.PageProvider
	at org.nuxeo.ecm.automation.core.impl.InvokableMethod.invoke(InvokableMethod.java:157)
	at org.nuxeo.ecm.automation.core.impl.CompiledChainImpl.doInvoke(CompiledChainImpl.java:124)
	at org.nuxeo.ecm.automation.core.impl.CompiledChainImpl.invoke(CompiledChainImpl.java:110)
	at org.nuxeo.ecm.automation.core.impl.OperationServiceImpl.run(OperationServiceImpl.java:169)
	... 98 more
Caused by: javax.el.PropertyNotFoundException: Property 'id' not found on type org.nuxeo.ecm.platform.usermanager.NuxeoPrincipalImpl
	at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:237)
	at javax.el.BeanELResolver$BeanProperties.access$400(BeanELResolver.java:214)
	at javax.el.BeanELResolver.property(BeanELResolver.java:325)
	at javax.el.BeanELResolver.getValue(BeanELResolver.java:85)
	at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:67)
	at org.jboss.el.parser.AstPropertySuffix.getValue(AstPropertySuffix.java:53)
	at org.jboss.el.parser.AstValue.getValue(AstValue.java:67)
	at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
	at org.nuxeo.ecm.automation.core.operations.services.DocumentPageProviderOperation.getParameters(DocumentPageProviderOperation.java:231)
	at org.nuxeo.ecm.automation.core.operations.services.DocumentPageProviderOperation.run(DocumentPageProviderOperation.java:182)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.nuxeo.ecm.automation.core.impl.InvokableMethod.doInvoke(InvokableMethod.java:135)
	at org.nuxeo.ecm.automation.core.impl.InvokableMethod.invoke(InvokableMethod.java:149)
	... 101 more