Fix function_clause caused by malformed accumulator
Fix function_clause caused by malformed accumulator

In a previous commit we added another item to the accumulator used by
load_docs. Unfortunately one clause was not modified so we send the
original 6-tuple, which then fails to match the function and crashes.

This affects searches of busy indexes, the user gets a function_clause
erorr instead of search results. It does not appear to prevent index
commits, though.

BugzID: 114420

cloudant-labs/dreyfus