Intervals vs Span guidance

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Intervals vs Span guidance

We are building our needed customizations/extensions on Solr/Lucene 7.7 or 8.0 or later. We are unclear on whether/when to use Intervals vs Span.

We know that Intervals is still maturing (new functionality in 8.0 and probably on-going for a while?)

But what is the overall intention/guidance? "If you need X, then use Spans." "If you need Y, then use Intervals." "After the year 20xy, we expect everyone to be using Intervals." ??

Any opinions valued.


PS. Apologies in advance if this got sent twice. (I'm pretty sure the first time failed.)