> db.collection.dropIndexes() { "nIndexesWas" : 3, "msg" : "non-_id indexes dropped for collection" , "ok" : 1 } > db.runCommand({insert: 'system.indexes' , documents: [ { key: {b: 1}, name: 'b_1' , ns: 'test.collection' } ] }) { "ok" : 1, "n" : 1 } > db.collection.getIndexes() [ { "v" : 1, "key" : { "_id" : 1 }, "name" : "_id_" , "ns" : "test.collection" }, { "v" : 1, "key" : { "b" : 1 }, "name" : "b_1" , "ns" : "test.collection" } ] > db.serverBuildInfo() { "version" : "2.6.0-rc2-pre-" , "gitVersion" : "d8eb19991b01f9fc5e73f0a3acd3f8a59e2d7c7d" , "OpenSSLVersion" : "", "sysInfo" : "Darwin As-MacBook-Pro-2.local 13.1.0 Darwin Kernel Version 13.1.0: Thu Jan 16 19:40:37 PST 2014; root:xnu-2422.90.20~2/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_49" , "loaderFlags" : "-fPIC -pthread -Wl,-bind_at_load -fstack-protector -mmacosx-version-min=10.6" , "compilerFlags" : "-Wnon-virtual-dtor -Woverloaded-virtual -fPIC -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -Werror -pipe -O0 -fstack-protector -Wno-unused-function -Wno-unused- private -field -Wno-deprecated-declarations -Wno-tautological-constant-out-of-range-compare -mmacosx-version-min=10.6" , "allocator" : "tcmalloc" , "versionArray" : [ 2, 6, 0, -8 ], "javascriptEngine" : "V8" , "bits" : 64, "debug" : true , "maxBsonObjectSize" : 16777216, "ok" : 1 }