Fluentd Not Sending Data to MongoDB

I am trying to send the parsed data from Fluentd to MongoDB. My system configuration is as below:


And MongoDB plugin: **fluent-plugin-mongo | 1.1.0**

My data is being parsed but I am not able to send it to Mongo. Here is my config file:

```

@type mongo
host 127.0.0.1
port 27017
user tti-prod
password mypassword
database fluent-testrun
collection requests
capped
capped_size 100m

@type tail
path /home/my-app/logs/%Y/%b/app.log
tag request.main
format /^\[(?[^\]]*)\] (?[^ ]*) (?\w*) (?[^ ]*) (?[^ ]*) (?\d*) (?[^ ]*) (?\d*) (?\d*)$/
time_format %Y-%m-%d %H:%M:%S
pos_file /tmp/fluentd--1516870436.pos

```
Can anyone explain this. There is no error log as such.