Indexing not updating with mongo river in elastic search

Hello,

i am using elastic search via mongo river and creating the real time index with specified mongo configuration.
after that some data has been indexed into _river but new data are not indexing.

please let me know, how can i fix this issue.

Elastic Version: elasticsearch-0.90.7
River Mongo : elasticsearch-river-mongodb/1.7.2

Thanks
Ashish