Elasticsearch: Remove stem words from index data using snowball analyzer.

stemword.rb

require 'elasticsearch'
require 'pp'

index_name = 'test'
@client = Elasticsearch::Client.new log: true
@client.indices.delete(index: index_name) rescue ''
@client.indices.create index: index_name,
                        body: {
                          settings: {
                            analysis: {
                              analyzer: {
                                default: {
                                  type: 'snowball',
                                }
                              },
                            }
                          },
                          mappings: {
                            document: {
                              properties: {
                                text: { type: 'string' }
                              }
                            }
                          }
                        }



['Playing', 'played', 'plays', 'player'].each do |text|
  @client.index(index: index_name, type: 'doc', body: {text: text})
end
@client.indices.refresh index: index_name

pp @client.search(index: index_name, q: 'play')
pp @client.search(index: index_name, q: 'plays')