Reindex multiple downsampled indexes into one cause invalid start/end_time

Hi Everyone,
I have a TSDS index and already downsample many backing indexes. Now, i want to reindex some of my downsampled indexes into 1 index (to reduce number of backing index). While it is possible by using POST _reindex Api, however when checking the destination index,

"time_series": {
        "end_time": "9999-12-31T23:59:59.999Z",
        "start_time": "-9999-01-01T00:00:00Z",
        "es87tsdb_codec": {
          "enabled": "true"

It seems that the start_time and end_time is not correct. I expect that if those indexes are sibling and could make continuous time range, start and end time would be the earliest and latest.

Do you have solution for this one? Do i have to update those manually somehow?

Best regards,

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