/**
     * Get the value for the key 'index.admin.double.fields'. <br>
     * The value is, e.g.  <br>
     * comment: Double-type fields for admin in the index.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexAdminDoubleFields();

    /**
     * Get the value for the key 'index.admin.double.fields' as {@link Integer}. <br>

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