How to Write Mongo Query(Intellishell) in Power BI Using R Script

Hi,

I have more than 3Million Records and mongodb connect via odbc but its performance is very slow,

then i tried connect via  R Script  its connected below query used:

library("mongolite")
m<- mongo(collection= "users", db = "admin", url = "mongodb://admin:[email protected]:27017", verbose = TRUE)
users<- m$find()

users<-m$find() its working but how to write R Script for getting Count

Thanks and Regards

Herwin