chg value from atribute to text node

gfl-plugin/src/main/resources/gfl-indexer.xslt

@@ -457,7 +457,7 @@ Refer to comments in the code to understand the used algorithm.
          <xsl:value-of select="@when" />
       </field>
       <field name="publish_day">
-         <xsl:value-of select="@sameAs" />
+         <xsl:value-of select="./text()/normalize-space()" />
       </field>
    </xsl:template>