extract ES actual search from View.call to ease overriding

NOTE: I think it would be best if the elasticsearch didn't generate
any HTML at all.

views.py

@@ -16,6 +16,8 @@
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 """elasticsearch search views"""
+from six import text_type as unicode
+
 from elasticsearch.exceptions import NotFoundError
 from elasticsearch_dsl import FacetedSearch, TermsFacet, DateHistogramFacet
 from bs4 import BeautifulSoup
@@ -25,7 +27,7 @@
 import cwtags.tag as t
 from cubicweb.view import StartupView
 
-from cubes.elasticsearch.es import indexable_types
+from cubes.elasticsearch.es import indexable_types, get_connection
 from cubes.elasticsearch.search_helpers import compose_search
 
 
@@ -83,12 +85,8 @@
         if search_comp:
             search_comp.render(w=self.w)
 
-    def call(self, **kwargs):
-        # TODO if no ES configuration, redirect or display warning
-        self.render_search_comp()
-        self.w(u'<h1>%s</h1>' % self._cw._('Recherche'))
-        query_string = xml_escape(self._cw.form.get('search', ''))
-        self.w(u'<h2>Resultats pour : <em>%s</em></h2>' % query_string)
+    def do_search(self, query_string):
+        get_connection(self._cw.vreg.config)
         facet_selections = {}
         start, stop = 0, 10
         parents_for = children_for = None
@@ -112,7 +110,7 @@
             self.w(unicode(json.dumps(search._s.to_dict())))
             self.w(u'<br/>')
         try:
-            response = search.execute()
+            return search.execute()
         except NotFoundError:
             self.w(u'index not found in elasticsearch')
             return
@@ -116,9 +114,19 @@
         except NotFoundError:
             self.w(u'index not found in elasticsearch')
             return
-        self.w(u'Resultats: %s' % response.hits.total)
-        if hasattr(response, 'facets'):
-            self.display_facets(response)
+
+    def call(self, **kwargs):
+        # TODO if no ES configuration, redirect or display warning
+        self.render_search_comp()
+        query_string = self._cw.form.get('search', '')
+        self.w(u'<h1>%s</h1>' % self._cw._('Recherche'))
+        response = self.do_search(query_string)
+        if response.hits.total:
+            self.w(u'<h2>Resultats pour : <em>%s</em></h2>' %
+                   xml_escape(query_string))
+            self.w(u'Resultats: %s' % response.hits.total)
+            if hasattr(response, 'facets'):
+                self.display_facets(response)
         self.display_results(response)
 
     def customize_search(self, query_string, facet_selections,