public T getOne(K value) {
		Field field = codec.encodeField(value);
		if (!fieldSpan.containsPoint(field)) {
			return null;
		}
		try {
			return store.findOneObject(columnIndex, field);
		}
		catch (IOException e) {
			errHandler.dbError(e);
			return null;
		}
	}
Get a unique object having the given value in the index field

<p>
Clients should use this method when the index behaves like a map, rather than a multimap. It
is the client's responsibility to ensure that duplicate values do not exist in the indexed
column.

@param value the value
@return the object, if found, or null
@throws IllegalStateException if the object is not unique
Ghidra/Debug/ProposedUtils/src/main/java/ghidra/util/database/DBCachedObjectIndex.java