increase rank by click and count Outlinks

English:Fess
2

(from github.com/marevol)
In app.xml, you can add ScoreFunctionBuilder:

...
    <component name="queryHelper" class="org.codelibs.fess.helper.QueryHelper">
        <postConstruct name="addBoostFunction">
            <arg>org.elasticsearch.index.query.functionscore.ScoreFunctionBuilders.fieldValueFactorFunction("click_count")
            </arg>
        </postConstruct>
...
    </component>
...