similarity-search

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe.

When I start the docker container

1. Set automatic backup condition parameters：

   1).backup condition by date（year，month，week，day）
   2).number of backup files retained

2. Recovery the data

   1).Identification by backup file，rest

I am finding a product which can replace Elasticsearch.

https://arxiv.org/abs/2006.09882

Current docker image size is insane. It is 2.55 GB. Reduce that to below 1GB or less. Apply changes from this reference: https://hackernoon.com/tips-to-reduce-docker-image-sizes-876095da3b34

Describe the bug

Elastiknn exceptions do not extend ElasticsearchException, so they seem to always be turned into a 500, when a 4xx would often be more appropriate.

Expected behavior

• When a query is incompatible with a mapping, use an exception that will get converted to a 400 response code. [See code where exception is initialized.](https://github.com/alexklibisz/elastiknn/blob