Filter a Field

>>> from techminer2.fields import filter_field
>>> filter_field(  
...     source="author_keywords",
...     dest="author_keywords_filtered",
...     filter_params = {
...         "metric": 'OCCGC',
...         "top_n": 10,
...         "occ_range": (None, None),
...         "gc_range": (None, None),
...         "custom_items": None,
...     },
...     database_params = {
...         "root_dir": "example/",
...         "database": "main",
...         "year_filter": (None, None),
...         "cited_by_filter": (None, None),
...     }
... )