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DocumentNodeStoreServiceMBean was introduced with OAK-2361 which was ported to 1.0 and was part of Oak 1.0.9 release.
Oak 1.0.12 current does not have this MBean registered. Looks like this registration was lost due to merge [1] for OAK-2506
[1] http://svn.apache.org/r1660153
OAK-2597 expose mongo's clusterNodes info more prominently