Batch update with aggregation in MongoDB

Question

I have a list of pipeline operations and would like to use the result to update on the collection by _id.

Right now I have something like this in java:

Cursor cursor = getCollection().aggregate(
                Arrays.asList(
                        pipeline1,
                        pipline2,
                        ...
                ), AggregationOptions.builder().allowDiskUse(true).batchSize(1000).build()
        );

how would I make it do the update as well without iterating through the cursor as it would co through my java service and update one by one. How would I something like:

[collection].updateMany(
    {},
    [
      pipeline1,
      pipeline2
    ]
)

instead? The aggregation result is very large (hundreds of thousands) so updating one by one isn't an option.

If there's some better way to do this please share too.