sfeos

Fix IsNull operator (#330) #850

Job	Run time
Python 3.8 testing with elasticsearch7	1m 50s
Python 3.8 testing with elasticsearch8	1m 50s
Python 3.8 testing with opensearch	1m 52s
Python 3.9 testing with elasticsearch7	1m 48s
Python 3.9 testing with elasticsearch8	2m 7s
Python 3.9 testing with opensearch	1m 47s
Python 3.10 testing with elasticsearch7	1m 50s
Python 3.10 testing with elasticsearch8	1m 48s
Python 3.10 testing with opensearch	1m 48s
Python 3.11 testing with elasticsearch7	2m 3s
Python 3.11 testing with elasticsearch8	2m 9s
Python 3.11 testing with opensearch	2m 5s
Python 3.12 testing with elasticsearch7	1m 51s
Python 3.12 testing with elasticsearch8	1m 45s
Python 3.12 testing with opensearch	1m 46s
	28m 19s

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