Upgrade elasticsearch gems to v6

These were very out of date. We update to v6 versions as we are
targetting v6 compatibility for now. This hopefully helps get us closer
to supporting v7 as well.

Gemfile

@@ -129,9 +129,9 @@ gem 'unf', '~> 0.1.4'
 gem 'seed-fu', '~> 2.3.7'
 
 # Search
-gem 'elasticsearch-model', '~> 0.1.9'
-gem 'elasticsearch-rails', '~> 0.1.9', require: 'elasticsearch/rails/instrumentation'
-gem 'elasticsearch-api',   '5.0.3'
+gem 'elasticsearch-model', '~> 6.1'
+gem 'elasticsearch-rails', '~> 6.1', require: 'elasticsearch/rails/instrumentation'
+gem 'elasticsearch-api',   '~> 6.8'
 gem 'aws-sdk'
 gem 'faraday_middleware-aws-signers-v4'
 

Gemfile.lock

@@ -235,17 +235,17 @@ GEM
       doorkeeper (~> 4.3)
       json-jwt (~> 1.6)
     ed25519 (1.2.4)
-    elasticsearch (5.0.3)
-      elasticsearch-api (= 5.0.3)
-      elasticsearch-transport (= 5.0.3)
-    elasticsearch-api (5.0.3)
+    elasticsearch (6.8.0)
+      elasticsearch-api (= 6.8.0)
+      elasticsearch-transport (= 6.8.0)
+    elasticsearch-api (6.8.0)
       multi_json
-    elasticsearch-model (0.1.9)
+    elasticsearch-model (6.1.0)
       activesupport (> 3)
-      elasticsearch (> 0.4)
+      elasticsearch (> 1)
       hashie
-    elasticsearch-rails (0.1.9)
-    elasticsearch-transport (5.0.3)
+    elasticsearch-rails (6.1.0)
+    elasticsearch-transport (6.8.0)
       faraday
       multi_json
     email_reply_trimmer (0.1.6)
@@ -270,7 +270,7 @@ GEM
     factory_bot_rails (5.1.0)
       factory_bot (~> 5.1.0)
       railties (>= 4.2.0)
-    faraday (0.12.2)
+    faraday (0.15.4)
       multipart-post (>= 1.2, < 3)
     faraday-http-cache (2.0.0)
       faraday (~> 0.8)
@@ -478,7 +478,7 @@ GEM
       tilt
     hangouts-chat (0.0.5)
     hashdiff (0.3.8)
-    hashie (3.5.7)
+    hashie (3.6.0)
     hashie-forbidden_attributes (0.1.1)
       hashie (>= 3.0)
     health_check (2.6.0)
@@ -506,7 +506,7 @@ GEM
       mime-types (~> 3.0)
       multi_xml (>= 0.5.2)
     httpclient (2.8.3)
-    i18n (1.7.0)
+    i18n (1.7.1)
       concurrent-ruby (~> 1.0)
     i18n_data (0.8.0)
     icalendar (2.4.1)
@@ -615,9 +615,9 @@ GEM
     mini_portile2 (2.4.0)
     minitest (5.11.3)
     msgpack (1.3.1)
-    multi_json (1.13.1)
+    multi_json (1.14.1)
     multi_xml (0.6.0)
-    multipart-post (2.0.0)
+    multipart-post (2.1.1)
     murmurhash3 (0.1.6)
     mustermann (1.0.3)
     mustermann-grape (1.0.0)
@@ -1048,7 +1048,7 @@ GEM
     truncato (0.7.11)
       htmlentities (~> 4.3.1)
       nokogiri (>= 1.7.0, <= 2.0)
-    tzinfo (1.2.5)
+    tzinfo (1.2.6)
       thread_safe (~> 0.1)
     u2f (0.2.1)
     uber (0.1.0)
@@ -1173,9 +1173,9 @@ DEPENDENCIES
   doorkeeper (~> 4.3)
   doorkeeper-openid_connect (~> 1.5)
   ed25519 (~> 1.2)
-  elasticsearch-api (= 5.0.3)
-  elasticsearch-model (~> 0.1.9)
-  elasticsearch-rails (~> 0.1.9)
+  elasticsearch-api (~> 6.8)
+  elasticsearch-model (~> 6.1)
+  elasticsearch-rails (~> 6.1)
   email_reply_trimmer (~> 0.1)
   email_spec (~> 2.2.0)
   escape_utils (~> 1.1)