Update data into a existing key

How can I update data in ES when we want to insert a huge amount of data

for example-
{
appName:test,
notes:test notes,
bulkData:[
{
id:345345,
name:test,
data:[
{temp:1},{temp;2}
]
}
]
}

now I want to add a few more data on bulkData, and also want to add few more data on bulkData.data,
how can I achieve this without deleting the existing index

Thanks in advance

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