[BUG] Latency info is not displayed when top queries by latency is enabled

[ansjcy]

What is the bug?

When I enable top queries by latency with UI and make search requests, the top queries are showing up on the overview page but latency info is not displayed.

How can one reproduce the bug?

• Enable top queries by latency on the UI

- Make search requests to the cluster - Check the overview page, the latency column shows "not enabled" - On the detail page, the stats are shown as "undefined", which is also not a good experience

What is the expected behavior?

The overview page should display latency info when enabled and detailed page should also say "not enabled" instead of undefined.

What is your host/environment?

macos.

Do you have any screenshots?

See above.

[ansjcy]

Will pick this up for 2.18

[ansjcy]

This is fixed by #15