Compound group id in the Java Driver using Aggregates.group

[Eric Fialkowski]

I'm trying to convert a $group pipeline option to use the Aggregates.group functionality. I can't figure out how to construct a compound grouping id.

Here is the $group step:

{$group: {_id: {aid: "$account_id", etl: "$etl_type"},max_mem: { $max: "$final_metrics.memory.max" }}},

Here is where I'm stuck:

group(<what goes here?>,max("max_mem","$final_metrics.memory.max"))

Single fields work fine, I can't figure out what to put to make multiple fields work.

[Jeff Yemin]

Try something like this:

group(new Document("aid", "$accound_id").append("etl", "$etl_type"),

        max("max_mem","$final_metrics.memory.max"));

Regards,

Jeff

[Eric Fialkowski]

Thanks, that worked. I was overthinking it and was trying to use something like fields(...)