[closed] Tell me about the data returned from https:///jts/indexing

The following comes from a customer interaction following an issue that was reported through our support channel. I will answer the question in the next post.

The status of indexing jobs is available from the indexing url (https://<server:port>/jts/indexing). Accessing this URL shows a page of XML with multiple <indexerStatus> elements. Child elements include, <backlog>, <remainingTime> and <indexSize>. Here is an example:

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...
<jazz:indexerStatus>
<jazz:nodeId>xt1sxlb0</jazz:nodeId>
<jazz:indexName>/rm</jazz:indexName>
<jazz:consumerKey>d73ff5a4d2a244bd90d3d2ae7a7574b2</jazz:consumerKey>
<jazz:backlog rdf:datatype="http://www.w3.org/2001/XMLSchema#int">215272</jazz:backlog>
<jazz:remainingTime rdf:datatype="http://www.w3.org/2001/XMLSchema#long">1047657</jazz:remainingTime>
<jazz:lastProcessedXSD rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2014-01-10T02:23:02.901Z</jazz:lastProcessedXSD>
<jazz:lastProcessed rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">Fri, 10 Jan 2014 02:23:02 GMT</jazz:lastProcessed>
<jazz:lastReceived rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">Fri, 10 Jan 2014 07:44:53 GMT</jazz:lastReceived>
<jazz:indexSize rdf:datatype="http://www.w3.org/2001/XMLSchema#long">17594615</jazz:indexSize>
<jazz:availability rdf:resource="http://jazz.net/xmlns/foundation/1.0/availability/recovering"/>
</jazz:indexerStatus>
....
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What do these numbers represent?
So what does the '215272' for the backlog, the represent?
And what does the '1047657' for remainingTime  represent?
And what does the '17594615' for /jazz:indexSize represent?