presto-main/src/main/java/io/prestosql/execution/TaskManagerConfig.java/TaskManagerConfig/setMaxIndexMemoryUsage
class TaskManagerConfig:    @Config("task.max-index-memory")
    public TaskManagerConfig setMaxIndexMemoryUsage(DataSize maxIndexMemoryUsage)
    {
        this.maxIndexMemoryUsage = maxIndexMemoryUsage;
        return this;
    }