[BUG][Log Explorer] Incorrect Time (timestamp) for stats query

[joshuali925]

What is the bug?
Run a stats query there will be a Time (timestamp) field that shows current time instead of time from the data

How can one reproduce the bug?
Steps to reproduce the behavior:

1. Go to https://playground.opensearch.org/app/observability-logs#/explorer
2. Run source = opensearch_dashboards_sample_data_flights | stats count() by span(timestamp, 1m)
3. See Time (timestamp) in the table that's incorrect

What is the expected behavior?
Should not show current time as results, can be misleading

What is your host/environment? playground

• OS: [e.g. iOS]
• Version [e.g. 22]
• Plugins

Do you have any screenshots?

Do you have any additional context?
Add any other context about the problem.