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Member "elasticsearch-6.8.23/docs/painless/painless-lambdas.asciidoc" (29 Dec 2021, 603 Bytes) of package /linux/www/elasticsearch-6.8.23-src.tar.gz:

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Lambda expressions and method references work the same as in Java.

list.removeIf(item -> item == 2);
list.removeIf((int item) -> item == 2);
list.removeIf((int item) -> { item == 2 });
list.sort((x, y) -> x - y);

You can make method references to functions within the script with this, for example list.sort(this::mycompare).