According to the facet examples in the pysolr client tests, you need to set the value for facet
parameter to 'on'. Like below:
solr = pysolr.Solr('http://localhost:8983/solr/', timeout=10)`
params = {
'facet': 'on',
'facet.field': 'q_date',
'rows': '0',
}
results = solr.search('video', **params)