Rolling upgrade from 5.6.6 to 6.3.2 fails due to NaN in float field

Hi,
I have NaNs in a float field. This worked in 5.6.6, but I can't upgrade to 6.y as it apparently doesn't like it.
As soon as I try to upgrade one node, I can see this in the log:

IllegalArgumentException[[float] supports only finite values, but got [NaN]

The question is: do I have to reindex, or could I get away with deleting the documents having NaNs?
Is there any other solution to a full reindex?

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