[Bug] [connector-doris] doris sink config: `doris.batch.size` not meeting expectations

[Larborator]

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• [X] I had searched in the issues and found no similar issues.

What happened

I found when the row reaches the size, the data of cached not write to server immediately. It depends on when checkpoint executed. Is this meet expectations?

SeaTunnel Version

2.3.5

SeaTunnel Config

{
    "env": {
        "parallelism": 1,
        "job.mode": "STREAMING",
        "job.name": "SeaTunnel",
        "checkpoint.interval": 5000,
        "execution.checkpoint.mode": "exactly-once"
    },
    "source": [{
        "plugin_name": "Kafka",
        "startup_mode": "LATEST",
        "commit_on_checkpoint": false,
        ...
    }],
    "sink": [{
        "plugin_name": "Doris",
        "fenodes": "",
        "username": "",
        "password": "",
        "table.identifier": "",
        "sink.enable-2pc": "false",
        "sink.label-prefix": "test",
        "doris.batch.size": 1,
        "doris.config": {
            "format": "json",
            "read_json_by_line": "true"
        }
    }]
}

Running Command

bin/start-seatunnel-flink-13-connector-v2.sh

Error Exception

no error exception

Zeta or Flink or Spark Version

No response

Java or Scala Version

No response

Screenshots

No response

Are you willing to submit PR?

• [ ] Yes I am willing to submit a PR!

Code of Conduct

• [X] I agree to follow this project's Code of Conduct