SERVER-11948 Add metadata field for write command requests
SERVER-11994 Fix logic error in processing of text search negated terms
SERVER-11949 add 30s timeout to config server batch writes
SERVER-11949 add 30s timeout to config server batch writes

Fix unit conversion error
SERVER-11987 extended sort stage to be limit-aware
SERVER-6353 tightened index bounds for $mod operator to minimize disk fetches