[Transform] remove old mixed cluster BWC layers, not required for 8x#79927

Merged

elasticsearchmachine merged 5 commits intoelastic:masterfrom hendrikmuhs:transform-cleanup-8x

Oct 28, 2021

+56-865

Commits on Oct 28, 2021

remove old mixed cluster BWC layers, not required for 8x
Hendrik Muhs
committed
apply spotless
Hendrik Muhs
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remove constructor indirection as its not required anymore after the removal
Hendrik Muhs
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remove serialization leftover
Hendrik Muhs
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remove superflous return statements
Hendrik Muhs
committed