title: Combine full text with other index
body: <p>I have a full text index and an index on a created date.</p>
  
  <p>My query on the date alone returns a nice, small 44 records very quickly (within a second):</p>
  
  <pre><code>&gt; db.oneMillionDocumentsIndexed.count({created: {$lte: ISODate("2016-02-06T15:34:59.019Z")} })
  44
  </code></pre>
  
  <p>However, if I combine this with the text search the query is incredibly slow:</p>
  
  <pre><code>&gt; db.oneMillionDocumentsIndexed.count({
                                  created: {$lte: ISODate("2016-02-06T15:34:59.019Z")}, 
                                  $text: { $search: "raven" } })
  </code></pre>
  
  <p>It appears to use both indexes:</p>
  
  <pre><code>{
      "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
  }    
  </code></pre>
  
  <p>Shouldn't the created date search reduce the number of documents, so speeding up the query?</p>
  
  <p>Whilst the documents aren't tiny, they aren't massive either.  Here's an example document:</p>
  
  <pre><code>{
      "_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 gï¿¥ï¾¡tterdï¿¥ï¾ exsecant costliness assertively cufic neurotomy subfebrile reassess eruption calciphobous epithecium adipopectic eruption neurotomy impaste shrugging oxytone depredating abbï¿¥ï¾½ 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. 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  }
  </code></pre>