Prioritise the movement of indexes belonging to deleted node over rest of the nodes during index rebalance

When there are too many indexes to be moved, index planner can keep moving the indexes belonging to the existing constrained node, leading to non-empty deleted indexer node at the end of planning.

Prioritisation of the indexes belonging to deleted node will help in convergence.

Replicas and partitions to be repaired also can be prioritised over rest of indexes, but only after movement of all the indexes belonging to the deleted nodes.

Without such prioritisation, rebalance may end up performing a large number of unnecessary index movements.

Need to analyse the impact of such prioritisation.