Stop runtime script from emitting too many values (backport of #61938) #62186
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This prevent `keyword` valued runtime scripts from emitting too many values or values that take up too much space. Without this you can put allocate a ton of memory with the script by sticking it into a tight loop. Painless has some protections against this but: 1. I don't want to rely on them out of sheer paranoia 2. They don't really kick in when the script uses callbacks like we do anyway. Relates to elastic#59332
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This prevent
keywordvalued runtime scripts from emitting too manyvalues or values that take up too much space. Without this you can put
allocate a ton of memory with the script by sticking it into a tight
loop. Painless has some protections against this but:
anyway.
Relates to #59332