solr - Where can I found some documentation about commit process? -

i know can found documentation commit process. i've looked on solr website didn't find i'm looking for.

i know commit make change (add, update or delete) visible in index. happens when call commit fonction ?

when add document, written in segment file ? or keeped in ram ? commit open writer write in segment ? commit merge segments or not ?

where can find informations commit process , adding document process ?

thanks

here links talk commit , optimize processes.

• solr commit , optimize questions
• lucene core - indexwriter.commit()
• solr commitwithin
• choosing solr/lucene commit strategy