ENG-5027 Change return protocol for serializeMore.
ENG-5027 Index clearing working in a unit test.
ENG-5027 Licensecheck whitespace.
ENG-5027 Merge from elastic.
ENG-5027 Fix index clearing.
ENG-5027 Fix index clearing (licensecheck fixes).
ENG-5027 Fix undo token handling and IPC.
ENG-5027 Test index materialization undo.
ENG-5027 Clean up index materialization bulk delete barrier.
ENG-5027 Address most review comments.
ENG-5027 More review-driven changes.
Merge pull request #710 from VoltDB/ENG-5027

ENG-5027 Delete materialized index tuples with undo support.