The FileSystem connector should allow preconfigured projections which don't match a filename filter

 "json-filter" : {
            "classname" : "filesystem",
            "directoryPath" : "target/federation/files-json-filter",
            "projections" : [ "default:/json_filter => /" ],
            "enableEvents" : true,
            "cacheTtlSeconds" : 0,
            "inclusionPattern" : ".+[.]json$"
        }

java.lang.AssertionError: Found a child reference in / to a non-existant child {}json_filter
	at org.modeshape.jcr.JcrSession.cachedNode(JcrSession.java:629)
	at org.modeshape.jcr.JcrSession.node(JcrSession.java:658)
	at org.modeshape.jcr.JcrSession.node(JcrSession.java:677)
	at org.modeshape.jcr.JcrSession.getNode(JcrSession.java:861)
	at org.modeshape.jcr.JcrSession.getNode(JcrSession.java:844)
	at org.modeshape.jcr.AbstractJcrRepositoryTest.assertNode(AbstractJcrRepositoryTest.java:119)