check all existing index

[junnplus]

Fixes #750.

We shouldn't just check the default index.

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[junnplus]

@chriskim06 I'm sorry to bother you, do you have any other thoughts on this PR. cc @ahmetb

[ahmetb]

I've manually verified this. It seems to be working fine. I added an extra integration test to ensure this scenario works. @Junnplus sorry to kept you waiting so long. /approve /lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahmetb, Junnplus

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