Change Bulk All to support Update requests

[aneetas]

Is your feature request related to a problem?

We are looking to use Update Requests so we can do a partial update of an Open Search document (using DocAsUpsert). We need to do a bulk transaction with these update requests. The _openSearchClient.Bulk(bulkRequest) currently supports this, however this method does not provide support for batching & retries. The _openSearchClient.BulkAll(documents,...) does support batching & retries, however this doesn't support UpdateRequests with the DocAsUpsert property.

What solution would you like?

We would like the _openSearchClient.BulkAll(documents,...) method to be updated to support BulkOperations such as Update, Delete. The BulkAll method currently only takes in documents and indexes them.

What alternatives have you considered?

A clear and concise description of any alternative solutions or features you've considered.

Do you have any additional context?

Add any other context or screenshots about the feature request here.

[dblock]

Makes sense. Assuming this is supported by OpenSearch server, want to try to contribute the feature?

[Xtansia]

@aneetas You can customise how the batches are converted into actual bulk requests using .BufferToBulk, assuming all the items should be update/upsert operations:

client.BulkAll(
            documents, 
            bulkAll => bulkAll
                .BufferToBulk((bulk, batch) => bulk
                    .UpdateMany(batch, (update, doc) => update
                        .Doc(doc)
                        .DocAsUpsert()
                    )
                )
            );

Do note however, BulkAll parallelises requests by default, so updates may happen out of order.

[aneetas]

@Xtansia thank you! I think that's all I need for the moment.