Limits search queries to 100 characters

Fixes #191

HISTORY.rst

@@ -31,6 +31,9 @@ Changelog
 - Adds full history and url sharing support to the calendar.
   [href]
 
+- Limits search queries to 100 characters.
+  [href]
+
 - Improve legibility for ticket badges with numbers > 99.
   [href]
 

onegov/town/models/search.py

@@ -6,6 +6,7 @@
 class Search(Pagination):
 
     results_per_page = 10
+    max_query_length = 100
 
     def __init__(self, request, query, page):
         self.request = request
@@ -47,10 +48,14 @@ def batch(self):
             explain=self.explain
         )
 
+        # queries need to be cut at some point to make sure we're not
+        # pushing the elasticsearch cluster to the brink
+        query = self.query[:self.max_query_length]
+
         # make sure the title matches with a higher priority, otherwise the
         # "get lucky" functionality is not so lucky after all
-        match_title = MatchPhrase(title={"query": self.query, "boost": 3})
-        match_rest = MultiMatch(query=self.query, fields=[
+        match_title = MatchPhrase(title={"query": query, "boost": 3})
+        match_rest = MultiMatch(query=query, fields=[
             'title', 'lead', 'text', 'email', 'function', 'number',
             'ticket_email', 'ticket_data', 'description', 'location',
             'group'