Source Only Snapshot Fails for Old Version Indices after Upgrading Cluster

Hello, I try to use snapshot on old indices, old indices is from es 6.5.1. I ugpraded to es 7.11.2
Since I want to reserve more spaces, I want to use _source only snapshot on indices, but I got an error when I try to use the snapshot,
because it is an old topic, I just want to know will this be fixed or nah,
maybe I can just put the old discussion thread because the topic wasn't answered, and the open issue on github wasn't answered too
the topic
the open issue
since none can answer the topic on the linked topic, maybe I can get the answer on this thread, thats my main reason why I recreate the thread

Thanks in advance

is there any solution or this is expected behavior?

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