Matt Porritt 0a9a10f029 MDL-58654 Global search: Allow engines to support batch processing.
Allow Global Search 3rd party engines to be much faster by supporting batch processing.
Refactor the iterator loop for the documents to add to the search index into its own method.
Move this new method from the manger class to the base engine class.
The move to the base engine class will allow search engine plugins to override this and determine
how they implment it. It will not break the existing interface contract with existing plugins.

Finally, add an elasped time indication to the trace output.
2017-05-31 08:28:12 +10:00
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