...
...
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<!-- Clinical analysis -->
...
<field name="intCreationDate" type="long" indexed="true" stored="true" multiValued="false"/>
<!-- Creation year, month and day will be used for facets -->
<field name="intCreationYear" type="int" indexed="true" stored="true" multiValued="false"/>
<field name="intCreationMonth" type="int" indexed="true" stored="true" multiValued="false"/>
<field name="intCreationDay" type="int" indexed="true" stored="true" multiValued="false"/>
<field name="intCreationDayOfWeek" type="string" indexed="true" stored="true" multiValued="false"/>
...