aws kinesis firehose to aws elasticsearch via lambda, how to modify or delete?

i'm trying incremental indexing kinesis firehose => lambda transform => amazon es.

The insert example is like that

const output = event.records.map((record) => {
    return {
        recordId: record.recordId,
        result: 'Ok',
        data: record.data,
    }
});

But how to modify, or delete specific index?

Seems to enable via http request, but the transform requires recordId, result, data as return value, in this doc.

Does anyone could answer about that?