benchmark_health_report: Query anomalies by benchmark/master.

dashboard/index.yaml

 # Datastore Composite Index Configuration.
 # https://developers.google.com/appengine/docs/python/config/indexconfig
 #
 # Below, most indexes come in pairs; one with the internal_only property,
 # one without. This is because all queries when the user is not logged in
 # have the filter internal_only == False.
 #
 # Composite index properties must be listed differently depending on how the
 # properties are used. There are three main ways to use properties in a query:
 #   (1) In an equality filter.
@@ skipping 103 matching lines @@
   properties:
   - name: internal_only
   - name: test
   - name: end_revision
 
 # Used in benchmark_health_report for querying benchmark by name
 # and master.
 - kind: Anomaly
   properties:
   - name: benchmark_name
+  - name: is_improvement
   - name: master_name
   - name: timestamp
     direction: desc
 
 - kind: Anomaly
   properties:
   - name: benchmark_name
   - name: internal_only
+  - name: is_improvement
   - name: master_name
   - name: timestamp
     direction: desc
 
+
 # Might be unused!
 # This index would enable querying for points for a particular test,
 # filtering or sorting by revision, and possibly doing a projection
 # query including value.
 - kind: Row
   properties:
   - name: parent_test
   - name: revision
   - name: value
 
@@ skipping 177 matching lines @@
   properties:
   - name: internal_only
   - name: master_name
   - name: bot_name
   - name: suite_name
   - name: test_part1_name
   - name: test_part2_name
   - name: test_part3_name
   - name: test_part4_name
   - name: test_part5_name