Fix some pydantic 2.0 `DeprecationWarning`s #746

Job	Run time
Python 3.8 testing with elasticsearch7	1m 51s
Python 3.8 testing with elasticsearch8	1m 45s
Python 3.8 testing with opensearch	1m 55s
Python 3.9 testing with elasticsearch7	2m 21s
Python 3.9 testing with elasticsearch8	1m 46s
Python 3.9 testing with opensearch	1m 51s
Python 3.10 testing with elasticsearch7	1m 46s
Python 3.10 testing with elasticsearch8	1m 47s
Python 3.10 testing with opensearch	1m 54s
Python 3.11 testing with elasticsearch7	2m 11s
Python 3.11 testing with elasticsearch8	2m 14s
Python 3.11 testing with opensearch	2m 5s
Python 3.12 testing with elasticsearch7	3m 56s
Python 3.12 testing with elasticsearch8	1m 47s
Python 3.12 testing with opensearch	1m 54s
	31m 3s

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