Time to live question: Can mortals and immortals live together in the same index?

After reading the documentation on TTL, it seems as though the following is
not supported:

Enable TLL processing but by default all documents live forever, and only
specific documents are indexed with "_ttl":"time" so that they are
expired after the time has passed.

Or is this an all-or-nothing proposition in which all documents are given a
TLL (even if a default).

In other words, if any documents are immortal, then all must be immortal?
And if at least one is to be made mortal, then all are mortal?

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