ESQL: Migrate all serialization of Expression #110157
Merged
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This moves all of
Expression
serialization from ESQL's home grown system intoNamedWriteable
which is how the rest of Elasticsearch works. We previously implementedNamedWriteable
on allExpression
subclasses and tested it. This just switches all production serialization over. It is wire compatible with the old custom way, so no one should notice anything other than less custom code.