"elasticsearch" gem usage

require "elasticsearch"

SearchClient = Elasticsearch::Client.new(
  url: ApplicationConfig["ELASTICSEARCH_URL"],
  retry_on_failure: 5,
  request_timeout: 30,
  adapter: :typhoeus,
  log: Rails.env.development?,
)

Index creation : 

index_settings = { number_of_shards: 1, number_of_replicas: 0 }
settings = { settings: { index: index_settings } }
SearchClient.indices.create(index: "tag_development", body: settings)

Mapping :

MAPPINGS = JSON.parse(File.read("config/elasticsearch/mappings/recipes.json"), symbolize_names: true).freeze
recipes.json content :
{
  "dynamic": "strict",
  "properties": {
    "id": {
      "type": "keyword"
    },
    "ingredients": {
      "type": "text",
      "fields": {
        "raw": {
          "type": "keyword"
        }
      }
    }
  }
}
SearchClient.indices.put_mapping(index: "tag_development", body: MAPPINGS)

Indexing document :
creating serializer:

module Search
  class RecipeSerializer
    include FastJsonapi::ObjectSerializer

    attributes :id, :ingredients
  end
end

adding record to elastic index:
serialized_data = Search::RecipeSerializer.new(record).serializable_hash.dig(:data, :attributes)
SearchClient.index(id: record.id, index: "tag_development", body: serialized_data)

Common query usage : 
with logical operators :
SearchClient.search(

  index: "tags_development",
  body: {
    query: {
      query_string: {
        query: "NOT rausvieji-svogunai",
        fields: [ "ingredients" ]
      }
    }
  }
)

return all documents(max 10000):
SearchClient.search(
  index: "tag_development",
  body: {
    query: {
      match_all: {}
    }
  }
)

get by id:
SearchClient.get(id: record.id, index: "tag_development")