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If server groups are unbalanced, currently index active and replica copies can end up in the same server group.

Then if the server group fails, both the active and replica are lost together.

Index placement should tolerate imbalance of server groups and ensure it places active and replica on different ones.

is parent task of

MB-49012 Use server group aware initial replica placement during replica repair

MB-36541 [ALTER INDEX] reducing number of replicas does not always honor server group constraints

1.	Increase number of max planner iterations from 20K to 100K	Open	Amit Kulkarni
2.	During index rebalance, prioritise movement of indexes which fix the server groups	Open	Amit Kulkarni
3.	Use server group aware initial replica placement during create index	Open	Amit Kulkarni
4.	Prioritise server group constraints over resource constraints in planner.	Open	Amit Kulkarni
5.	Enable auto index redistribution to new nodes on rebalance - by default	Open	Amit Kulkarni
6.	Analyse impact of equivalent indexes on replica placement across server groups	Open	Amit Kulkarni

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Index placement should always ensure that active and replica as in different server groups