public Builder setCacheMaxSize(long cacheMaxSize) {
            this.cacheMaxSize = cacheMaxSize;
            return this;
        }
optional, lookup cache max size, over this value, the old data will be eliminated.
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/redis/src/main/java/org/apache/inlong/sort/redis/common/config/RedisLookupOptions.java