Minor - P4 the following warnings in stage_builder.cpp are cryptic and no use to users. They should be better explained and use proper sentences.
For example
- idx ==> index
- fts ==> text search
- ns ==> namespace
- cant ==> Can't
- no questions
no text idx, or more than one text idx?
master: in src/mongo/db/query/stage_builder.cpp:214
Can't find idx <var> in ns
master: in src/mongo/db/query/stage_builder.cpp:81
cant parse fts query
master: in src/mongo/db/query/stage_builder.cpp:233
Can't ixscan null ns
master: in src/mongo/db/query/stage_builder.cpp:73
Can't fast-count null ns (coll null)
master: in src/mongo/db/query/stage_builder.cpp:281
null collection for text?
master: in src/mongo/db/query/stage_builder.cpp:208
Can't distinct-scan null ns
master: in src/mongo/db/query/stage_builder.cpp:257
Can't fast-count null ns (db null)
master: in src/mongo/db/query/stage_builder.cpp:275