Is there a way to remove or quarantine multiple search peers (indexers) at the same time? It's not practical enough for me to do it for on every search (one by one) head like the document states.
removing number of indexers from your indexer cluster depends on your replication & search factor. for example if you have replication factor 2 and you would like to remove two indexers, there is a high chance of having two copies in those indexers. hence you can't remove indexers at same time. you can remove one by one.