public boolean containsKey(K key) {
		Field encoded = codec.encodeField(key);
		if (!fieldSpan.containsPoint(encoded)) {
			return false;
		}
		return containsKey(encoded);
	}
Check if there is any object having the given value for its indexed field

<p>
This method is more efficient than using {@code get(key).isEmpty()}, since it need only find
one match, whereas {@link #get(Object)} will retrieve every match. Granted, it doesn't make
sense to immediately call {@link #get(Object)} after {@link #containsKey(Object)} returns
true.
Ghidra/Debug/ProposedUtils/src/main/java/ghidra/util/database/DBCachedObjectIndex.java