Reinstall vs upgrade beats

Elastic Stack Beats
1

Hi

I have a question. I have recently upgraded Elastic search and kibana to 7 from 6.7.

On few of the servers I have prior to 6.7 beats version running. What happens if I uninstall 6.x version and resinstall filebeat7 instead of upgrading to 6.7 and then to 7.

Is there any disadvantage doing that.

2

Other than the work you need to do, not really.

3

Will I have lot of rework to be done and what will happen to the indices created by the old beats. Will it be still accessible or I cannot access it due to the new template and mappings from beats 7.