Bump elasticsearch-model from 5.0.1 to 6.0.0 (#787)

Bump elasticsearch-model from 5.0.1 to 6.0.0

Author: Alan Gabbianelli

Gemfile

@@ -5,7 +5,7 @@ ruby IO.read('.ruby-version').strip
 gem 'audited', '~> 4.8'
 gem 'cancancan', '~> 3.0'
 gem 'elasticsearch', '~> 5.0.5'
-gem 'elasticsearch-model', '~> 5.0.1'
+gem 'elasticsearch-model', '~> 6.0.0'
 gem 'elasticsearch-rails', '~> 6.0.0'
 gem 'gds-sso'
 gem 'govuk_app_config', '~> 1.19.0'

Gemfile.lock

@@ -87,9 +87,9 @@ GEM
       elasticsearch-transport (= 5.0.5)
     elasticsearch-api (5.0.5)
       multi_json
-    elasticsearch-model (5.0.1)
+    elasticsearch-model (6.0.0)
       activesupport (> 3)
-      elasticsearch (~> 5)
+      elasticsearch (> 1)
       hashie
     elasticsearch-rails (6.0.0)
     elasticsearch-transport (5.0.5)
@@ -439,7 +439,7 @@ DEPENDENCIES
   database_cleaner
   dotenv-rails (~> 2.7)
   elasticsearch (~> 5.0.5)
-  elasticsearch-model (~> 5.0.1)
+  elasticsearch-model (~> 6.0.0)
   elasticsearch-rails (~> 6.0.0)
   factory_bot_rails (~> 5.0)
   gds-sso