Add maxResults option to control number of results returned from elastalert.

Author: johnsusek

src/controllers/test/index.js

@@ -37,6 +37,11 @@ export default class TestController {
             processOptions.push('--formatted-output');
           }
 
+          if (options.maxResults > 0) {
+            processOptions.push('--max-query-size');
+            processOptions.push(options.maxResults);
+          }
+
           if (options.alert) {
             processOptions.push('--alert');
           }

src/handlers/test/post.js

@@ -9,7 +9,8 @@ const optionsSchema = Joi.object().keys({
   testType: Joi.string().valid('all', 'schemaOnly', 'countOnly').default('all'),
   days: Joi.number().min(1).default(1),
   alert: Joi.boolean().default(false),
-  format: Joi.string().default('')
+  format: Joi.string().default(''),
+  maxResults: Joi.number().default(0)
 }).default();
 
 function analyzeRequest(request) {