Hi Luca,

I mentioned this single use case in another ticket, where we discussed several things: #106

I wanted to create a dedicated issue for this specific case.
I am powering a filter/search of a table with minisearch. And users are able to add and remove columns from that table. the recreation of the index is quite the performance hit on that page and I am trying to make reindexing more performant on data changes. One of these scenarios is adding of a column. Currently I am creating a complete new index, just to add or remove a single field.

It would be great, if there is an api to add or remove a single field from the index. Or event doing it for every individual document with the current value of the field would be fine.