public WatermarkKind fromString(String kindString) {
        if (LOW.name().equalsIgnoreCase(kindString)) {
            return LOW;
        } else if (HIGH.name().equalsIgnoreCase(kindString)) {
            return HIGH;
        } else {
            return END;
        }
    }
The watermark kind.
Copy from com.ververica:flink-cdc-base:2.3.0.
inlong-sort/sort-flink/cdc-base/src/main/java/org/apache/inlong/sort/cdc/base/source/meta/wartermark/WatermarkKind.java