In ref to https://tickets.metabrainz.org/browse/INST-729

it would be good if Search took into account Instrument Credits - ones used in relationships.

it would immensely help users searching for an instrument to use in a relationship, if also already existing instrument credits would show.
Additionally It will help me find duplications, possible instrument-split-outs, aliases that should be added, related instruments, etc

also see https://chatlogs.metabrainz.org/brainzbot/metabrainz/msg/4698018/