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You can disable hit highlighting / search snippets by commenting out the entire <property name="hitHighlightingConfiguration"> Configuration in the [dspace]/config/spring/api/discovery.xml configuration file.

PLEASE BE AWARE there are two sections where this <property> definition existexists. You should comment out both. One is under the <bean id="defaultConfiguration"> and one is under the <bean id="homepageConfiguration">

Alternatively, you can may also choose to tweak which fields are shown in hit highlighting, or modify the number of matching words shown (snippets) and/or number of characters shown around the matching word (maxSize).

For this change to take effect in the User Interface, you will need to restart Tomcat.

<property name="hitHighlightingConfiguration">
    <bean class="org.dspace.discovery.configuration.DiscoveryHitHighlightingConfiguration">
        <property name="metadataFields">
            <list>
                <bean class="org.dspace.discovery.configuration.DiscoveryHitHighlightFieldConfiguration">
                    <property name="field" value="dc.title"/>
                    <property name="snippets" value="5"/>
                </bean>
                <bean class="org.dspace.discovery.configuration.DiscoveryHitHighlightFieldConfiguration">
                    <property name="field" value="dc.contributor.author"/>
                    <property name="snippets" value="5"/>
                </bean>
                <bean class="org.dspace.discovery.configuration.DiscoveryHitHighlightFieldConfiguration">
                    <property name="field" value="dc.subject"/>
                    <property name="snippets" value="5"/>
                </bean>
                <bean class="org.dspace.discovery.configuration.DiscoveryHitHighlightFieldConfiguration">
                    <property name="field" value="dc.description.abstract"/>
                    <!-- NumberMax number of characters to display around the matching word (Warning setting to 0 returns entire field) -->
                    <property name="maxSize" value="250"/>
                    <!-- Max number of snippets (matching words) to show -->
                    <property name="snippets" value="2"/>
                </bean>
                <bean class="org.dspace.discovery.configuration.DiscoveryHitHighlightFieldConfiguration">
					<!-- Displays snippets from indexed full text of document (for supported formats) -->
                    <property name="field" value="fulltext"/>
                    <!-- Max number of characters to display around the matching word (Warning setting to 0 returns entire field) -->
                    <property name="maxSize" value="250"/>
					<!-- Max number of snippets (matching words) to show -->
                    <property name="snippets" value="2"/>
                </bean>
            </list>
        </property>
    </bean>
</property>