The link seems to not work anymore but I'm guessing you're referring to
`CONNECTION_MAX_RETRY_TIMEOUT_OPTION`. This is used in the
`*DynamicSinkFactory` classes, such as [1]. These can be used when
defining Table API/SQL sources using DDL or the programmatic API. The
actual field is never used but it will be used to check the allowed
options when verifying what users specify via "string" options.