The original proposal below was to support this with new syntax {listIndexes: "*"}. Another option is to add $listIndexes support to the agg framework and allow such pipelines to be specified over an entire database by omitting the collection name:

myDB.runCommand({aggregate: 1, cursor: {}, pipeline: [{$listIndexes: {}}, ...]});

Original description

We've found that we needed the ability to get all indexes for a db, similar to how we used to be able to query "system.indexes". We've patched mongod to enable this with the command `{'listIndexes': '*'}`.

Would anyone be interested in us submitting this to upstream?