OpenSearchDocumentStore: No handler for type [flattened] declared on field [answer]

[ZanSara]

Discussed in #1603

^{Originally posted by pallie97 October 15, 2021}
Hello. I am trying to use AWS OpenSearch Service (version: OpenSearch1.0) for my document store -- I am using JupyterLab with Python 3.7 and the latest Haystack version. When I try to create the document store in my notebook with OpenSearchDocumentStore(), I receive the following error:

RequestError(400, 'mapper_parsing_exception', 'No handler for type [flattened] declared on field [answer]').

I am unsure if this is an AWS issue or if it's something the Haystack community can help me with. I have tried setting index_type = 'hnsw' in the OpenSearchDocumentStore constructor and also tested different versions of ElasticSearch in AWS, but still get the same error.

I appreciate any help, thanks!

[ZanSara]

@tholor: probably related to #1398, do you know what might be happening?

[tholor]

I am able to reproduce the error and will investigate the root cause - very likely related to our recent refactoring in #1398

[tholor]

@pallie97 It should be fixed now in master. Can you please verify if this works on your end now, too?

[pallie97]

@tholor It is working for me now. Thank you so much!