[ERROR] elasticsearch mongodb river - filter is null

es_gist

[2013-02-28 13:29:02,102][INFO ][cluster.metadata         ] [Kl'rt] [_river] creating index, cause [auto(index api)], shards [1]/[1], mappings []
[2013-02-28 13:29:02,249][INFO ][cluster.metadata         ] [Kl'rt] [_river] update_mapping [mongodb] (dynamic)
[2013-02-28 13:29:02,290][INFO ][river.mongodb            ] [Kl'rt] [mongodb][mongodb] river name [org.elasticsearch.river.RiverName@35f80e40] monitoring namespace [profile.person]
[2013-02-28 13:29:02,290][INFO ][river.mongodb            ] [Kl'rt] [mongodb][mongodb] starting mongodb stream: host [localhost], port [27017], gridfs [false], filter [null], db [profile], indexing to [mongoindex]/[person]
[2013-02-28 13:29:02,325][INFO ][cluster.metadata         ] [Kl'rt] [mongoindex] creating index, cause [api], shards [5]/[1], mappings []
[2013-02-28 13:29:02,480][INFO ][river.mongodb            ] [Kl'rt] [mongodb][mongodb] Start indexer thread.
[2013-02-28 13:29:02,482][INFO ][river.mongodb            ] [Kl'rt] [mongodb][mongodb] Start tailer thread.
[2013-02-28 13:29:02,592][INFO ][river.mongodb            ] [Kl'rt] [mongodb][mongodb] filter is null.
[2013-02-28 13:29:02,599][INFO ][cluster.metadata         ] [Kl'rt] [_river] update_mapping [mongodb] (dynamic)
[2013-02-28 13:29:07,618][INFO ][river.mongodb            ] [Kl'rt] [mongodb][mongodb] filter is null.
[2013-02-28 13:29:12,621][INFO ][river.mongodb            ] [Kl'rt] [mongodb][mongodb] filter is null.
[2013-02-28 13:29:17,623][INFO ][river.mongodb            ] [Kl'rt] [mongodb][mongodb] filter is null.