Elasticsearch Index Pattern

I am sourcing data from the end point using metricbeat. What I have noticed is that the index pattern date changes everyday (for example it was metricbeat-6.0.0-2017.11.16 yesterday and today it is metricbeat-6.0.0-2017.11.17 ) . Is that normal? Because when this happens, the data streaming stops. How do i prevent this from happening?

Yes that is normal.

What do you mean by that?

I am able to see the data until the end point was online. The next day when i boot it up, it does not start capturing the data (No data available for today) . Then i look into the indexes Elasticsearch has learnt and see that there is a new index available with a new data stamp.

That shouldn't stop metricbeat from sending data.
What do the logs from it show?