Get all documents matching a list of values for a field

I am using multisearch (msearch from elasticsearch-py) to search for all documents using a list of document ids from a list of indices. The id's are explicitly assigned. The goal is to look for existing documents (using a list of ids) and update documents that already exist and create a new index if the document does not exist. Since there could be more than 10K ids to search for, I use this piece of code for the search.

        results = []
        chunks = [list_with_ids[x:x+10000] for x in range(0, len(list_with_ids), 10000)]
        for chunk in chunks:
            if len(chunk)>0:
                request = []
                for _, index in enumerate(list_of_indices):
                    req_head = {'index': index}
                    req_body = {
                        "query": {
                            "ids": {
                            "values": chunk
                    request.extend([req_head, req_body])
                        result = client.msearch(body=request)
                    for response in result['responses']:

The query seems to run fine for the most part but, sometimes it seems like the query does not return all the documents that match the query -- this makes it as if the document with some ids do not already exist on elasticsearch and the remaining part of my code (not shown here) creates a new document for it, thus creating documents. How can we ensure that all matching documents are returned?

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