monkeypatch pysolr to allow custom requesthandler

solr_custom_request_handler.py

import pysolr

def monkeypatch_pysolr(handler='edismax', solr=None):
    if solr is None:
        solr = pysolr.Solr('http://localhost:8080/solr')
    def better_select(params):
        self = solr
        params['wt'] = 'json'
        params_encoded = pysolr.safe_urlencode(params, True)
        if len(params_encoded) < 1024:
            path = '%s/?%s' % (handler, params_encoded)
            return self._send_request('get', path)
        else:
            path = '%s/' % handler
            headers = {'Content-type': 'application/x-www-form-urlencoded; charset=utf-8',}
            return self._send_request('post', path, body=params_encoded, headers=headers)
    solr._select = better_select
    return solr