Database
[{"_id":1,"name":"TestProject","projectData":{"nodes":[{"data":{"_id":{"$oid":"6022bc959b559276bd39f4be"},"nodeData":{"tags":[]}}},{"data":{"_id":{"$oid":"7022bc959b559276bd39f4ce"},"nodeData":{"tags":[]}}},{"data":{"_id":{"$oid":"8022bc959b559276bd39f4de"},"nodeData":{"tags":[]}}}]}}]
Query
db.collection.update({},{$set:{"projectData.nodes.$[d].data.nodeData.tags":["tag1","tag2"]}},{arrayFilters:[{"d.data._id":{$in:[ObjectId("6022bc959b559276bd39f4be"),ObjectId("7022bc959b559276bd39f4ce")]}}]})