elasticsearch_primary_index.rb

def raw_put(path, body)
  conn = Faraday.new url: 'http://localhost:9200'
  conn.put(path) do |req|
    req.body = body.to_json
    req.headers['Content-Type'] = 'application/json'
  end
end

# Create primary index
req_body = {
  settings: {
    index: {
      number_of_shards:   5, # In production, this number would be much larger
      number_of_replicas: 1
    }
  },
  mappings: {
    patient_type: {
      properties: {
        patient_name: { index: 'not_analyzed', type: 'string' },
        content: { index: 'not_analyzed', type: 'string' }
      }
    }
  }
}
raw_put 'patients', req_body
client.indices.exists? index: 'patients' # => true