Getting error index.max_inner_result_window during rolling upgrade of ES from 5.6.10 to 6.8.10

Elastic Stack Elasticsearch
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Hi team,

I have 2 data nodes and 3 master nodes in an ES cluster. I was doing a rolling upgrade as ES suggested moving from 5.6.10 to 6.8.10.

As there should be zero downtime, I was testing that and getting one error.

I have upgraded the 1 data node and do basic search testing. It is working fine. When I have upgraded 2nd node search is breaking with the below Error.

java.lang.IllegalArgumentException: Top hits result window is too large, the top hits aggregator [top]'s from + size must be less than or equal to: [100] but was [999]. This limit can be set by changing the [index.max_inner_result_window] index level setting.

index.max_inner_result_window -- This property was introduced in the 6.X version, and the master node is still on 5.6.10. So what will be the solution with 0 downtimes?

Note: My indexing is stopped completely.

Thanks,
Het

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Hi @elasticsearch,

Can anybody help to solve the problem?

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