import com.liferay.portal.kernel.dao.orm.DynamicQuery
import com.liferay.portal.kernel.dao.orm.RestrictionsFactoryUtil
import com.liferay.portal.kernel.search.Indexer
import com.liferay.portal.kernel.search.IndexerRegistryUtil
import com.liferay.portlet.journal.model.JournalArticle
import com.liferay.portlet.journal.service.JournalArticleLocalServiceUtil

Indexer jaIndexer = IndexerRegistryUtil.getIndexer(JournalArticle.class);

def resKeyArray = []
def articles = JournalArticleLocalServiceUtil.getArticles()
articles.each { JournalArticle item ->
    if (!resKeyArray.contains(item.getResourcePrimKey())) {
        resKeyArray.add(item.getResourcePrimKey())
    }
}

resKeyArray.each {long key ->
    jaIndexer.reindex(JournalArticle.class.getName(), key);
}