Fix assignment of template field in __init__ in weaviate

[romsharon98]

related: #36484

fix:

WeaviateIngestOperator's constructor lacks direct assignments for instance members corresponding to the following template fields (i.e., self.field_name = field_name or 
super.__init__(field_name=field_name, ...) ):
['input_data']

change those because of typing error and this error:

cc: @shahar1

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