[FLINK-25153] Inappropriate variable naming

[zuston]

What is the purpose of the change

Make variable naming appropriate

Brief change log

Make variable naming appropriate

Verifying this change

yes

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• Dependencies (does it add or upgrade a dependency): (yes / no)
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• The S3 file system connector: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

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CI report:

• 5418807 Azure: SUCCESS

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Last check on commit 31b81d9 (Fri Dec 03 08:12:45 UTC 2021)

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[zuston]

Minor fix @zentol

[RocMarshal]

Good catch. @zuston .
LGTM +1.

[zuston]

Good catch. @zuston .

LGTM +1.

Thanks! @RocMarshal