Query embedded document in MongoDB

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I have a document with embedded documents, How can I query embedded document, I need to find _content = "africa"

I have tried following queries with no result

db.cluster.find({"clusters":{"cluster":{"tag":{"_content":"africa"}}}})
db.cluster.find({"clusters.cluster.tag.[_content]":"africa"})
db.cluster.find({"clusters":{"$elemMatch":{"_content":"africa"}}})

{"clusters":  {"source":"Panthera leo",        
"total":2,     
"cluster":[
{"total":45, 
"tag":[{"_content":"lion"}, {"_content":"zoo"}, 
{"_content":"africa"},{"_content":"wildlife"}, 
{"_content":"animal"},{"_content":"lioness"}, 
{"_content":"bigcat"},{"_content":"cat"}, 
{"_content":"flickrbigcats"},  {"_content":"nature"}, {"_content":"animals"}, 
{"_content":"safari"}, {"_content":"leo"}, {"_content":"mammal"},   
{"_content":"africanlion"}, {"_content":"lions"},
{"_content":"kenya"}, {"_content":"panthera"}, {"_content":"southafrica"},  
{"_content":"nikon"},
{"_content":"feline"}, {"_content":"tanzania"}, {"_content":"felidae"}, 
{"_content":"cats"},
{"_content":"mane"}, {"_content":"impressedbeauty"}, {"_content":"male"}, 
{"_content":"animalplanet"},
{"_content":"predator"}, {"_content":"abigfave"}, {"_content":"cub"}, 
{"_content":"wild"}, {"_content":"bigcats"},
{"_content":"canon"}, {"_content":"african"}, {"_content":"carnivore"}, 
{"_content":"botswana"}, 
{"_content":"vosplusbellesphotos"}, {"_content":"female"},   
{"_content":"anawesomeshot"}, 
{"_content":"malelion"}, 
{"_content":"leeuw"}, {"_content":"parkstock"}, {"_content":"masaimara"}, 
{"_content":"mammals"}
]
}, 
{"total":3, 
"tag":[{"_content":"specanimal"}, {"_content":"animalkingdomelite"}, 
{"_content":"naturesfinest"}
]}]}, "stat":"ok"}

asked 6 mins ago

Deepak Khattar

1

Query embedded document in MongoDB