Error
Error Code:
181
MongoDB Error 181: Resolving Index Key Pattern Ambiguity
Description
This error indicates that MongoDB cannot uniquely interpret the specified index key pattern. It typically occurs during index creation or modification when the definition contains conflicting field specifications, invalid multikey index rules, or ambiguous paths for embedded documents.
Error Message
Ambiguous Index Key Pattern
Known Causes
3 known causesConflicting Field Specifications
The same field is specified multiple times within a single index definition, possibly with different sort orders or properties, making the pattern ambiguous.
Invalid Multikey Index Path
An attempt to create a multikey index involves an array field and a subfield within that same array, leading to an unclear index path.
Ambiguous Embedded Document Paths
The index definition includes paths to fields within embedded documents that overlap or create an uncertain indexing strategy for MongoDB.
Solutions
Coming SoonDetailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:
General Troubleshooting Tips
- Check the error message carefully for specific details
- Review recent changes that might have caused the error
- Search for the exact error code in the official documentation
- Check log files for additional context
- Try restarting the application or service