[Feature Request] BigDecimal and Complex Number Support

[911432]

Is your feature request related to a problem? Please describe

OpenSearch and OpenSearch-Dashboards do not support BigDecimal and complex numbers.

Describe the solution you'd like

BigDecimal and Complex Number would like to be supported in OpenSearch and OpenSearch-Dashboard.

Related component

Other

Describe alternatives you've considered

It would be nice if it was supported when OpenSearch 3.0 is released.

Additional context

I would like to use a document-type database that supports BigDecimal and Complex Number and can fix the data type.

[krisfreedain]

Catch All Triage - 1 2

[kkewwei]

@911432 , it has been discussed since 2016(elastic/elasticsearch#17006), but it has not been implemented yet. Before we support it, it is best to understand why it has not been implemented yet.