Search: Remove not needed get_after() call

Remove the ineffective get_after() slicing call from the
CloudSearchQuery object. The listing pagination logic is applied in the
SearchBuilder object.

Add the search request offset and size to the CloudSearchQuery object
to support searcher pagination.

r2/r2/lib/cloudsearch.py

@@ -837,39 +837,46 @@ class CloudSearchQuery(object):
 
     def __init__(self, query, sr=None, sort=None, syntax=None, raw_sort=None,
                  faceting=None, recent=None, include_over18=True,
-                 rank_expressions=None):
+                 rank_expressions=None, start=0, num=1000):
         if syntax is None:
             syntax = self.default_syntax
         elif syntax not in self.known_syntaxes:
             raise ValueError("Unknown search syntax: %s" % syntax)
+        self.syntax = syntax
+
         self.query = filters._force_unicode(query or u'')
         self.converted_data = None
-        self.syntax = syntax
+        self.bq = u''
+
+        # filters
         self.sr = sr
+        self._recent = recent
+        self.recent = self.recents[recent]
+        self.include_over18 = include_over18
+
+        # rank / rank expressions
         self._sort = sort
         if raw_sort:
             self.sort = raw_sort
         else:
             self.sort = self.sorts[sort]
         self.rank_expressions = rank_expressions
-        self._recent = recent
-        self.recent = self.recents[recent]
-        self.include_over18 = include_over18
+
+        # pagination
+        self.start = start
+        self.num = num
+
+        # facets
         self.faceting = faceting
-        self.bq = u''
+
         self.results = None
 
-    def run(self, after=None, reverse=False, num=1000, _update=False):
+    def run(self, _update=False):
         results = self._run(_update=_update)
-
-        docs, hits, facets = results.docs, results.hits, results._facets
-
-        after_docs = r2utils.get_after(docs, after, num, reverse=reverse)
-
-        self.results = Results(after_docs, hits, facets)
+        self.results = Results(results.docs, results.hits, results._facets)
         return self.results
 
-    def _run(self, start=0, num=1000, _update=False):
+    def _run(self, _update=False):
         '''Run the search against self.query'''
         q = None
         if self.syntax == "cloudsearch":
@@ -886,7 +893,7 @@ class CloudSearchQuery(object):
             g.log.info("%s", self)
         return self._run_cached(q, self.bq.encode('utf-8'), self.sort,
                                 self.rank_expressions, self.faceting,
-                                start=start, num=num, _update=_update)
+                                start=self.start, num=self.num, _update=_update)
 
     def customize_query(self, bq=u''):
         return bq