public <K> DBCachedObjectIndex<K, T> getIndex(Class<K> fieldClass, String columnName) {
		int columnIndex = getColumnByName(columnName);
		return getIndex(fieldClass, columnIndex);
	}
Get the index for a given column by name

<p>
See {@link DBCachedObjectStoreFactory} for an example that includes use of an index

@param <K> the type of the object field for the indexed column
@param fieldClass the class specifying {@link K}
@param columnName the name of the indexed column
@return the index
@throws IllegalArgumentException if the given column is not indexed
Ghidra/Debug/ProposedUtils/src/main/java/ghidra/util/database/DBCachedObjectStore.java