Strict dynamic mapping is going to cause issues

[strawgate]

trafficstars

Our use of strict dynamic mappings instead of false means that extra fields cause document rejection instead of just ignoring the non-matching fields.

This means we cannot add fields to documents as updating the index template doesnt take effect until the datastream performs rollover.

We need to either:

1. Quickly update 0.7.0 with dynamic mappings set to false and provide instructions on how to manually rollover indices
2. Check if the current index_template has dynamic mappings set to true and perform a one-off update of the dynamic setting for the current write indices of all open datastreams via PUT /my-data-stream/_mapping?write_index_only=true with the new value for the dynamic setting

[strawgate]

Included option 2 in https://github.com/legrego/homeassistant-elasticsearch/pull/290

[legrego]

Included option 2 in #290

I'm good with this approach, thanks.