ESQL: Update generated code

When we compile the code for `CONTAINS` we generate an evaluator java
class and commit that, as is our ancient custom. But because elastic#133016
didn't see elastic#133392, we committed out of date code. That's fine because
we regenerate the code on every compile. But it's annoying because every
clone is out of date. This updates the generated file.

You may be asking "why do you commit the generated code if you just
generate it at compile time?" That's a good question! It's a grand
tradition, one that we will probably one day leave behind. But let's
celebrate it today by committing more code.

Author: nik9000