Feedback on /admin/upgrade/rolling.md: Clarify disabling auto-rebalancing

[amotl]

Documentation feedback

• Page title: Rolling Upgrade
• Page URL: https://cratedb.com/docs/guide/admin/upgrade/rolling.html
• Source: https://github.com/crate/cratedb-guide/blob/main/docs/admin/upgrade/rolling.md

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At step 1, we are not sure if this statement is sufficient.

SET GLOBAL TRANSIENT "cluster.routing.allocation.enable" = 'new_primaries';

The current thinking is that disabling auto-rebalancing would be a better option.

[hammerhead]

Hi.

We are revising the rolling upgrade guide in #599 and updated cluster.routing.allocation.enable to primaries according to Elasticsearch recommendations. As per the documentation, the parameter covers both initial allocations as well as rebalances:

[...] only primaries can be moved or created.

There also won't be any recovery action before gateway.recover_after_time (5 minutes by default).

[amotl]

Excellent, thank you.