The current implementation of the crawler does not support such kind of indexing. We will surely consider this for implementing though.
What I can suggest you so far is to create your own indexing provider
which indexes the items. Please refer to the blog post In the mean time series (part 4): BONUS TRACK - "Products" module – implementing search index
for an information on creating custom indexing providers.
I hope this helps.
the Telerik team
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