db.foo.drop()
db.foo.ensureIndex({description: "text"})
db.foo.insert({_id:1,  description:"radionuclides", language:"English"})
db.foo.insert({_id:2,  description:"chromosome", language:"English"})
db.foo.insert({_id:3,  description:"study", language:"English"})
db.foo.insert({_id:4,  description:"chemical", language:"English"})
db.foo.insert({_id:5,  description:"radiopharmaceuticals", language:"English"})
db.foo.insert({_id:6,  description:"transduction", language:"English"})
db.foo.insert({_id:7,  description:"constraints", language:"English"})
db.foo.insert({_id:8,  description:"novel", language:"English"})
db.foo.insert({_id:9,  description:"responsible", language:"English"})
db.foo.insert({_id:10, description:"cancer", language:"English"})
db.foo.insert({_id:11, description:"description", language:"English"})
db.foo.insert({_id:12, description:"sensor", language:"English"})

// These terms are NOT found
db.foo.runCommand( "text", { search: "radionuclides" } ).stats.n
db.foo.runCommand( "text", { search: "chromosome" } ).stats.n
db.foo.runCommand( "text", { search: "study" } ).stats.n
db.foo.runCommand( "text", { search: "chemical" } ).stats.n
db.foo.runCommand( "text", { search: "radiopharmaceuticals" } ).stats.n
db.foo.runCommand( "text", { search: "transduction" } ).stats.n
db.foo.runCommand( "text", { search: "consequences" } ).stats.n
db.foo.runCommand( "text", { search: "responsible" } ).stats.n
db.foo.runCommand( "text", { search: "constraints" } ).stats.n
db.foo.runCommand( "text", { search: "description" } ).stats.n

// These terms are found
db.foo.runCommand( "text", { search: "novel" } ).stats.n
db.foo.runCommand( "text", { search: "cancer" } ).stats.n
db.foo.runCommand( "text", { search: "sensor" } ).stats.n

db.foo.update({}, {$unset:{language:1}}, {multi:true})

// Now all terms are found
db.foo.runCommand( "text", { search: "radionuclides" } ).stats.n
db.foo.runCommand( "text", { search: "chromosome" } ).stats.n
db.foo.runCommand( "text", { search: "study" } ).stats.n
db.foo.runCommand( "text", { search: "chemical" } ).stats.n
db.foo.runCommand( "text", { search: "radiopharmaceuticals" } ).stats.n
db.foo.runCommand( "text", { search: "transduction" } ).stats.n
db.foo.runCommand( "text", { search: "consequences" } ).stats.n
db.foo.runCommand( "text", { search: "responsible" } ).stats.n
db.foo.runCommand( "text", { search: "constraints" } ).stats.n
db.foo.runCommand( "text", { search: "description" } ).stats.n
db.foo.runCommand( "text", { search: "novel" } ).stats.n
db.foo.runCommand( "text", { search: "cancer" } ).stats.n
db.foo.runCommand( "text", { search: "sensor" } ).stats.n