final String[] updateIndices = response1.indices();
        final GetIndexResponse response2 =
                client.admin().indices().prepareGetIndex().addIndices(searchAlias).execute().actionGet(fessConfig.getIndexIndicesTimeout());
        final String[] searchIndices = response2.indices();

     * The value is, e.g. 1m <br>
     * comment: Timeout for index indices operations.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexIndicesTimeout();

    /**
     * Get the value for the key 'index.filetype'. <br>
     * The value is, e.g. text/html=html<br>
     * application/msword=word<br>