We are upgrading to ES 6.x from 5.6.7. As the documentation specifies it can be rolling upgrade.
We are using the transport client and my question is regarding the same.
Can we continue writing/reading data when we have a mix of 5.6.7 and 6.x nodes in the cluster using a transport client compatible with 5.6.7.
I assume internal communication between ES nodes happens over the transport interface. How does this work in case of 5.6.7 and 6.x nodes in a cluster at the same time?