Index option to skip keys that are too large

Currently if there is any document with a key too large to be indexed (>1024), an error will be thrown and the index will not be created.

I would like to have an option to skip those values and index all the other keys.

As far as I can see, this can not be achieved with partial indices for multikey indices, since partial indices can only exclude the entire document from being indexed, not a single element from the array being indexed.