Restore executionHint serialization from version V_8_500_014 #96965
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This was replaced by optional serialization in version V_8_500_018 in #96943, breaking backwards compatibility for serverless.
https://gradle-enterprise.elastic.co/s/r57ljjurthlow/tests/:modules:secure-settings:internalClusterTest/co.elastic.elasticsearch.settings.secure.FileSecureSettingsServiceIT/testIncrementSettings?top-execution=1
Related to #95903