json output for command fulltextsearch:search is not implemented

[pmarini-nc]

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Steps to reproduce

1. Run occ fulltextsearch:search --output=json admin samplestring
2. Observe the output

Expected behaviour

Output should be json-formatted

Actual behaviour

Output is not json-formatted

Server configuration

Latest version of Nextcloud and FullTextSearch apps to date, that is 31.0.7.