How to solve the issue 【Setting index.mapper.dynamic is deprecated since indices may not have more than one type anymore】

After I executed the following API,
PUT /zipkin*/_settings
{
"index.blocks.read_only_allow_delete": false
}
I got the following feedback.
#! Deprecation: Setting index.mapper.dynamic is deprecated since indices may not have more than one type anymore.
{
"acknowledged": true
}

Why do I get such a feedback?
How to solve this issue?

Thanks.

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