Made the correlated-prefix the default policy for filtered-datasets. Documented merge policies and filters.

Change-Id: I6c93d87b9fcee1f69601f5fd05192e56dd288879
Reviewed-on: http://fulliautomatix.ics.uci.edu:8443/176
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: abdullah alamoudi <bamousaa@gmail.com>
diff --git a/asterix-doc/src/site/site.xml b/asterix-doc/src/site/site.xml
index feef881..37c3474 100644
--- a/asterix-doc/src/site/site.xml
+++ b/asterix-doc/src/site/site.xml
@@ -79,6 +79,7 @@
       <item name="AQL Allen's Relations Functions" href="aql/allens.html"/>
       <item name="AQL Support of Similarity Queries" href="aql/similarity.html"/>
       <item name="Accessing External Data" href="aql/externaldata.html"/>
+      <item name="Filter-Based LSM Index Acceleration" href="aql/filters.html"/>
       <item name="REST API to AsterixDB" href="api.html"/>
     </menu>