title: FOS ElasticaSearch Unrecognized options index_analyzer search_analyzer mappings
body: <p>I'm blocked by Symfony error:</p>
  
  <blockquote>
    <p>Unrecognized options "index_analyzer, search_analyzer, mappings" under
    "fos_elastica.indexes.optro.types.technical_assistance"</p>
  </blockquote>
  
  <p>I use Symfony 3.4.11 and FOS-ElasticSearch 5.03.</p>
  
  <p>What's wrong? File indentation?<br>
  Part of Config file: </p>
  
  <pre><code>types:
    technical_assistance:
      index_analyzer: my_nGram_index_analyzer
      search_analyzer: my_nGram_search_analyzer
      mappings:
        subject: { boost: 2 }
        description: ~
        equipment_reference: ~
        filename: ~
        trackingNumber: ~
        requester:
          type: "object"
          properties:
            first_name: ~
            last_name: ~
        section:
          type: "object"
          properties:
            name: ~
            translatedNames: ~
        messages:
          type: "object"
          properties:
            content: { boost: 0.5 }
            filename: ~
      persistence:
        driver: orm
        model: Optro\HelpdeskBundle\Entity\TechnicalAssistance
        provider: ~
        listener: ~
        finder:
          service: optro.finder.raw.technical_assistance
  </code></pre>