arangosh> db.test.ensureIndex({ type: "hash", fields: [ "a" ] });
{
"deduplicate" : true,
"fields" : [
"a"
],
"id" : "test/73816",
"isNewlyCreated" : true,
"name" : "idx_1641835679842304002",
"selectivityEstimate" : 1,
"sparse" : false,
"type" : "hash",
"unique" : false,
"code" : 201
}
arangosh> db.test.save({ a : 1 });
{
"_id" : "test/73820",
"_key" : "73820",
"_rev" : "_ZG8Lmam---"
}
arangosh> db.test.save({ a : 1 });
{
"_id" : "test/73822",
"_key" : "73822",
"_rev" : "_ZG8Lmam--A"
}
arangosh> db.test.save({ a : null });
{
"_id" : "test/73824",
"_key" : "73824",
"_rev" : "_ZG8Lmaq---"
}