},
      "content_length_filter": {
        "type": "length",
        "max": 30
      },
      "limit_token_count_filter": {
        "type": "limit",
        "max_token_count": 10000
      },
      "stemmer_en_filter": {
        "type": "stemmer",
        "name": "possessive_english"
      },
      "arabic_stop": {
        "type":       "stop",
        "stopwords":  "_arabic_"

    /**
     * Index name.
     */
    protected String index;

    /**
     * Scroll timeout in milliseconds.
     */
    protected int scrollTimeout = 60000;

    /**
     * Scroll size for search requests.
     */
    protected int scrollSize = 100;

    /**
     * Buffer size for bulk operations.
     */
    protected int bulkBufferSize = 10;