Hi and welcome :) There are a variety of interfaces that you can use to send multiple documents at a time. (you can start on this, page, more info on the next few pages as well https://solr.apache.org/guide/solr/latest/indexing-guide/indexing-with-update-handlers.html )
Sending in batches using those interfaces is standard practice. If you mean pre-calculating the indexed data to minimize load on the server, then pre-indexed fields are one option. ( https://solr.apache.org/guide/solr/latest/indexing-guide/external-files-processes.html#the-preanalyzedfield-type) - for that JesterJ (a project I (mostly) wrote) has some built in support: https://github.com/nsoft/jesterj/blob/master/code/ingest/src/main/java/org/jesterj/ingest/processors/PreAnalyzeFields.java - I've used that particular processor in one project successfully so far. I've also heard of folks indexing on one system and then copying or replicating indexes to a destination system. (this is a custom engineered type of thing) All of the above is subject to our commit intervals and/or manual commit requests (typically only use the manual requests in special cases with careful planning) So there are several possibilities (and also some I haven't mentioned involving streaming expressions), but it would help to have a more detailed description of the problem you are trying to solve (as opposed to asking after the solution you expect to need). -Gus http://www.needhamsoftware.com (work) https://a.co/d/b2sZLD9 (my fantasy fiction book)
