*/
    public String getBoostExpression() {
        return boostExpression;
    }

    /**
     * Sets the boost expression used to calculate boost values.
     *
     * @param expression the boost expression string
     */
    public void setBoostExpression(final String expression) {
        boostExpression = expression;
    }

    /**
     * Gets the current match expression.

		<postConstruct name="addBoostDocumentRule">
			<arg>
				<component class="org.codelibs.fess.indexer.BoostDocumentRule">
					<property name="matchExpression">"url.matches(\".*fess.*\")"</property>
					<property name="boostExpression">"1000.0"</property>
				</component>
			</arg>
		</postConstruct>
		 -->
	</component>
	<component name="crawlerStatsHelper"
		class="org.codelibs.fess.helper.CrawlerStatsHelper">
	</component>