ENH: add search term for retrieving Entries that are nested under an ancestor #249

Job	Run time
standard / Documentation / Python 3.9: documentation building	40s
standard / pre-commit checks / pre-commit	14s
standard / Conda (3.12, true) / Python 3.12: conda	2m 54s
standard / Conda (3.10) / Python 3.10: conda	2m 51s
standard / Conda (3.11, true) / Python 3.11: conda	2m 53s
standard / Conda (3.9, true) / Python 3.9: conda	3m 2s
standard / Pip (3.10) / Python 3.10: pip	1m 13s
standard / Pip (3.11, true) / Python 3.11: pip	1m 13s
standard / Pip (3.12, true) / Python 3.12: pip	1m 16s
standard / Pip (3.9, true) / Python 3.9: pip	1m 18s
standard / Documentation / Documentation deployment	0s
	17m 34s

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