now I want to add a few more data on bulkData(key), and also later want to add few more data on bulkData.data(key),
how can I achieve this without deleting the existing index
May be. With the update API. But I don't really recommend using it. Behind the scene, it will do anyway the same thing.
IMHO update by query is useful if you have very very big JSON documents to update and you want to limit the bandwidth usage.
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