ES: optimize an index

app/elastic/application_search.rb

@@ -10,35 +10,16 @@ module ApplicationSearch
 
     settings \
       index: {
-        query: {
-          default_field: :name
-        },
         analysis: {
           analyzer: {
-            my_analyzer:{
-              type: "custom",
-              tokenizer: "ngram_tokenizer",
-              filter: %w(lowercase asciifolding name_ngrams)
-            },
-            search_analyzer: {
-              type: "custom",
+            default:{
               tokenizer: "standard",
-              filter: %w(lowercase asciifolding)
+              filter: ["standard", "lowercase", "my_stemmer"]
             }
-          },
-          tokenizer: {
-            ngram_tokenizer: {
-              type: "nGram",
-              min_gram: 1,
-              max_gram: 20,
-              token_chars: %w(letter digit connector_punctuation punctuation)
-            }
-          },
           filter: {
-            name_ngrams: {
-              type:     "nGram",
-              max_gram: 20,
-              min_gram: 1
+            my_stemmer: {
+              type: "stemmer",
+              name: "light_german"
             }
           }
         }

app/elastic/issues_search.rb

@@ -9,13 +9,9 @@ module IssuesSearch
 
       indexes :iid,         type: :integer, index: :not_analyzed
       indexes :title,       type: :string,
-                            index_options: 'offsets',
-                            search_analyzer: :search_analyzer,
-                            analyzer: :my_analyzer
+                            index_options: 'offsets'
       indexes :description, type: :string,
-                            index_options: 'offsets',
-                            search_analyzer: :search_analyzer,
-                            analyzer: :my_analyzer
+                            index_options: 'offsets'
       indexes :created_at,  type: :date
       indexes :updated_at,  type: :date
       indexes :state,       type: :string

app/elastic/merge_requests_search.rb

@@ -9,21 +9,14 @@ module MergeRequestsSearch
 
       indexes :iid,           type: :integer
       indexes :target_branch, type: :string,
-                              index_options: 'offsets',
-                              search_analyzer: :search_analyzer,
+                              index_options: 'offsets'
                               analyzer: :my_analyzer
       indexes :source_branch, type: :string,
-                              index_options: 'offsets',
-                              search_analyzer: :search_analyzer,
-                              analyzer: :my_analyzer
+                              index_options: 'offsets'
       indexes :title,         type: :string,
-                              index_options: 'offsets',
-                              search_analyzer: :search_analyzer,
-                              analyzer: :my_analyzer
+                              index_options: 'offsets'
       indexes :description,   type: :string,
-                              index_options: 'offsets',
-                              search_analyzer: :search_analyzer,
-                              analyzer: :my_analyzer
+                              index_options: 'offsets'
       indexes :created_at,    type: :date
       indexes :updated_at,    type: :date
       indexes :state,         type: :string

app/elastic/milestones_search.rb

@@ -7,13 +7,9 @@ module MilestonesSearch
     mappings do
       indexes :id,          type: :integer
       indexes :title,       type: :string,
-                            index_options: 'offsets',
-                            search_analyzer: :search_analyzer,
-                            analyzer: :my_analyzer
+                            index_options: 'offsets'
       indexes :description, type: :string,
-                            index_options: 'offsets',
-                            search_analyzer: :search_analyzer,
-                            analyzer: :my_analyzer
+                            index_options: 'offsets'
       indexes :project_id,  type: :integer
       indexes :created_at,  type: :date
 

app/elastic/notes_search.rb

@@ -7,9 +7,7 @@ module NotesSearch
     mappings do
       indexes :id,          type: :integer
       indexes :note,        type: :string,
-                            index_options: 'offsets',
-                            search_analyzer: :search_analyzer,
-                            analyzer: :my_analyzer
+                            index_options: 'offsets'
       indexes :project_id,  type: :integer
       indexes :created_at,  type: :date
 

app/elastic/projects_search.rb

@@ -8,25 +8,15 @@ module ProjectsSearch
       indexes :id,                  type: :integer
 
       indexes :name,                type: :string,
-                                    index_options: 'offsets',
-                                    search_analyzer: :search_analyzer,
-                                    analyzer: :my_analyzer
+                                    index_options: 'offsets'
       indexes :path,                type: :string,
-                                    index_options: 'offsets',
-                                    search_analyzer: :search_analyzer,
-                                    analyzer: :my_analyzer
+                                    index_options: 'offsets'
       indexes :name_with_namespace, type: :string,
-                                    index_options: 'offsets',
-                                    search_analyzer: :search_analyzer,
-                                    analyzer: :my_analyzer
+                                    index_options: 'offsets'
       indexes :path_with_namespace, type: :string,
-                                    index_options: 'offsets',
-                                    search_analyzer: :search_analyzer,
-                                    analyzer: :my_analyzer
+                                    index_options: 'offsets'
       indexes :description,         type: :string,
-                                    index_options: 'offsets',
-                                    search_analyzer: :search_analyzer,
-                                    analyzer: :my_analyzer
+                                    index_options: 'offsets'
 
       indexes :namespace_id,        type: :integer
 

app/elastic/snippets_search.rb

@@ -8,17 +8,11 @@ module SnippetsSearch
       indexes :id,          type: :integer
 
       indexes :title,       type: :string,
-                            index_options: 'offsets',
-                            search_analyzer: :search_analyzer,
-                            analyzer: :my_analyzer
+                            index_options: 'offsets'
       indexes :file_name,   type: :string,
-                            index_options: 'offsets',
-                            search_analyzer: :search_analyzer,
-                            analyzer: :my_analyzer
+                            index_options: 'offsets'
       indexes :content,     type: :string,
-                            index_options: 'offsets',
-                            search_analyzer: :search_analyzer,
-                            analyzer: :my_analyzer
+                            index_options: 'offsets'
       indexes :created_at,  type: :date
       indexes :updated_at,  type: :date
       indexes :state,       type: :string