[9.1] [Downsampling++] Allow merging of passthrough mappers with object mappers under certain conditions. (#135431)#135670

gmarouli wants to merge 2 commits intoelastic:9.1elastic/elasticsearch:9.1from

gmarouli:backport/9.1/pr-135431gmarouli/elasticsearch:backport/9.1/pr-135431Copy head branch name to clipboard