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exists — MongoDB Manual
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MongoDB check if a field exists in a document
23 Common MongoDB Operators & How To Use Them – BMC Software | Blogs
javascript - Mongodb check If field exists in an sub-document of an array - Stack Overflow
exists — MongoDB Manual
MongoDB $exists Operator: Check if a Field Exists | CodeForGeek
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mongodb - How to use the element query operator ($exists) for a nested document? - Stack Overflow
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How to use $exists operator in MongoDB
Query on Embedded/Nested Documents — MongoDB Manual
JSON Query Expression Functions — MongoDB Connected System 1.1 documentation
How to use $exists operator in MongoDB
23 Common MongoDB Operators & How To Use Them – BMC Software | Blogs
