DAM Index not working

[#1]

we're using AEM 6.1 and tyring to query all the properties from the metadata node under dam:Asset.so we created an index using the below link

http://aempodcast.com/2016/aem-resources/indexing-properties-nodes-aem-6-0-6-1/#.Wa6kkFWGPIU 

but we keep on getting a warning message in the log, and query itself takes a long time to run.

Warning Message:*WARN* [JobHandler: /etc/workflow/instances/server0/2017-09-05/report_17:/content/dam/XYZ] org.apache.jackrabbit.oak.spi.query.Cursors$TraversingCursor Traversed 71000 nodes with filter Filter(query=SELECT * FROM [nt:unstructured] AS metadatas WHERE ISDESCENDANTNODE(metadatas,'/content/dam/XYZ') and NAME() like '%metadata%', path=/content/dam/XYZ//*, property=[:localname=[(%metadata%..]]); consider creating an index or changing the query

Is there anything else we need to do?

[#2]

Watch this GEMS session - it was done by AEM ENg: Oak Lucene Indexes

[#3]

we wanted to index all properties of metadata node

so we've done as per page 16 in the pdf in that link

but we are still seeing the error

[#4]

If you are following what was shown in the GEMS session and its not working - could be a bug somewhere - please log a support ticket so Eng can fix it.