To save only the first match for each element in a collection, use an
ee.Join.saveFirst(). The saveFirst() join functions in an
equivalent way to the saveAll() join, except for each element in the
primary collection, it simply saves the first element from the
secondary collection matching the condition specified in the
ee.Filter. Unmatched elements in the primary collection
are dropped. Unless a sorting property and an order are supplied (as in the
saveAll example), the first element saved might be
any of the elements in the list found by saveAll() with the same filter.
Save-First Joins
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Last updated 2021-05-26 UTC.