rollback elasticsearch version for travis

Author: vaughanbrittonsage

script/docker-compose.yml

@@ -2,7 +2,7 @@ version: '2.1'
 
 services:
   elasticsearch:
-    image: elasticsearch:6.4.3
+    image: elasticsearch:5.6-alpine
     container_name: elasticsearch
     environment:
       - "ES_JAVA_OPTS=-Xms512m -Xmx512m"

spec/elastic_search_framework/index_spec.rb

@@ -80,8 +80,7 @@
           'normalizer' => {
             'custom_normalizer' => {
               'filter' => ['lowercase'],
-              'type' => 'custom',
-              'char_filter' => []
+              'type' => 'custom'
             }
           },
           'analyzer' => {