ingest API requires at least one field

src/plugins/kibana/server/lib/schemas/resources/index_pattern_schema.js

@@ -18,6 +18,6 @@ module.exports = Joi.object({
       script: Joi.string(),
       lang: Joi.string()
     })
-  ).required(),
+  ).required().min(1),
   field_format_map: Joi.object()
 });

test/unit/api/ingest/_post.js

@@ -31,6 +31,10 @@ define(function (require) {
             .send(_.set(createTestData(), 'fields', {}))
             .expect(400),
 
+          request.post('/kibana/ingest')
+            .send(_.set(createTestData(), 'fields', []))
+            .expect(400),
+
           // Fields must have a name and type
           request.post('/kibana/ingest')
             .send(_.set(createTestData(), 'fields', [{count: 0}]))