ES5.0.0-rc1 - Index_not_found_exception

I am currently running 5.0.0-rc1 version of ELK stack in ubuntu 14.04
The error i face is this

My config file is :
input { stdin { } }
output {
elasticsearch { }
stdout { codec => rubydebug }
}
I would really appreciate any insight on how to solve this error.
TIA