[GeoNetwork-users] Geonetwork 3.0.4: delete keywords in Keywords advanced search

I loaded metadata into my geonetwork 3.0.4 with associated keywords.
If I make an advanced search and expand Keywords combobox I find Keywords
matching nothing in my catalog (i.e. boundaries, geonetwork,
geoserver,....).
How can I delete this Keywords?
Thanks in advance.

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