fix bug that lack param of batchSize for Doris Sink config

[baisui1981]

Purpose of this pull request

Which issue you fix

Fixes # (issue 1171).

Checklist:

• I have executed the 'mvn spotless:apply' command to format my code.
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• I have made corresponding changes to the documentation.
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• New and existing unit tests pass locally with my changes.
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[Paddy0523]

LGTM @FlechazoW