Tengo un índice de texto completo y un índice en una fecha de creación.

Mi consulta solo en la fecha devuelve un bonito y pequeño 44 registros muy rápidamente (en un segundo):

> db.oneMillionDocumentsIndexed.count({created: {$lte: ISODate("2016-02-06T15:34:59.019Z")} })
44

Sin embargo, si combino esto con la búsqueda de texto, la consulta es increíblemente lenta:

> db.oneMillionDocumentsIndexed.count({
                                created: {$lte: ISODate("2016-02-06T15:34:59.019Z")}, 
                                $text: { $search: "raven" } })

Parece usar ambos índices:

{
    "queryPlanner" : {
        "plannerVersion" : 1,
        "namespace" : "test.oneMillionDocumentsIndexed",
        "indexFilterSet" : false,
        "parsedQuery" : {
            "$and" : [
                {
                    "created" : {
                        "$lte" : ISODate("2016-02-06T15:34:59.019Z")
                    }
                },
                {
                    "$text" : {
                        "$search" : "raven",
                        "$language" : ""
                    }
                }
            ]
        },
        "winningPlan" : {
            "stage" : "FETCH",
            "filter" : {
                "created" : {
                    "$lte" : ISODate("2016-02-06T15:34:59.019Z")
                }
            },
            "inputStage" : {
                "stage" : "TEXT",
                "indexPrefix" : {

                },
                "indexName" : "$**_text",
                "parsedTextQuery" : {

                }
            }
        },
        "rejectedPlans" : [ ]
    },
    "serverInfo" : {
        "host" : "Plod",
        "port" : 27017,
        "version" : "3.0.7",
        "gitVersion" : "6ce7cbe8c6b899552dadd907604559806aa2e9bd"
    },
    "ok" : 1
}    

¿No debería la búsqueda de fecha creada reducir la cantidad de documentos, acelerando así la consulta?

Si bien los documentos no son pequeños, tampoco son masivos. Aquí hay un documento de ejemplo:

{
    "_id" : ObjectId("56b612a2b6c13d2bec221d22"),
    "created" : ISODate("2016-02-06T15:34:57.954Z"),
    "adoptability-integer" : 1885631649,
    "impoverisher-double" : 0.78982932576436,
    "auriga-short-string" : "unpunished",
    "pistillate-long-string" : "raven nationalistic supergalaxies shit candidacy vengefulness baghla inharmony breviaries subcoracoid facet numbles Achaian hyksos g￥ﾡtterdï¿¥ï¾ exsecant costliness assertively cufic neurotomy subfebrile reassess eruption calciphobous epithecium adipopectic eruption neurotomy impaste shrugging oxytone depredating abb￥ﾽ unfaithfulness clive amman meteorology dollond del cussed malversation Determinateness wadset busher precedent warder lithest tuberculinize kythera swiping hyperopic installation otosclerosis costly joyance neenah saliently bicepses myograph blackmur. salable radiational copaiva seisure animism franglais chalkboard astride preaortic machinelike criseyde easternmost theological. goloshes amber assertively universalism pterylological abortifacient entrepï¾¢t nordic intricate canvasser unscholastic caria marginal prakritic gal tambur seascouting branchiform vaticide hysteroidal. vario chefoo permanganic solidillu lashings permanganic denatured chartres Nonenergetically pabx coinheritance koulibiaca wrathless unrejoicing kodly confutable Juru changelessness ratite pol lightener pansy portadown unpeg iontophoresis Ruddily overcorrupt rondure midair mobocrat. Rals sind teaser hussism definiteness piperidine septicity procryptic salicaceous catalpa Stingy panegyrise Baddie wodan preoccasioned ndebele sanitizing mulga grantedly selectman dep overscruple mealies subsellia noncompressible lepidoptera nonequilateral vï¿¥ï¾ racemiform carob preaccredit parramatta. piatigorsky unmanifest eulogized bolometric circumnavigating stare. prewitt branchiform canadianizing untinselled crossruf anthozoic del dragrope pronative foulness incessancy sultanate debunker guncotton reindictment uninstalled pieter buying prestwick anguish dicrotism permissible. nonscarcity labialising underswamp nondegradation incubating unwillable dealer Rewinded jaggedness jasmine flatfootedness edgily choregraphic unpenetrating unwhited devotedly thornton irremediably reentry cordilleras inhospitable blenchingly hedgehop. nontribesman semiexhibitionist streetlike outgeneral Spatiality hyacinthides prometheus tingly tenacious Aerologist promonarchy nonsophistical uhuru 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}