@Override
    protected void encodeThis(ByteBuffer buffer) {
        super.encodeThis(buffer);
        putString(fieldName, buffer);
    }
This represents a query where all terms are required to match in the same element id.
The primary use case is to allow efficient search in arrays and maps of struct.
The common path is the field name containing the struct.

@author baldersheim
container-search/src/main/java/com/yahoo/prelude/query/SameElementItem.java