Not precisely sure where we were in 2011, but I think these are the biggest ones that came after, off the top of my head (i.e sure to be missing something):

Not precisely sure where we were in 2011, but I think these are the biggest ones that came after, off the top of my head (i.e sure to be missing something): - Merging content and index clusters to one to make index clusters elastic and auto-recovering on data loss. - Fully realtime writes. - Support more advanced machine-learned ranking through tensors. - Streaming (personal) search supporting a large write rate. - Document references. - WAND and RANK operators. - Rank features over multivalue text fields. - Predicate fields. - Lots and lots of performance work.