Pressure thrust is not that important for suction lines.The usually used EJ on suction line is the untied bellow.Apart from the vertical settlement the use of expansion joint(untied) also allows for rotation and misalignments which can be critical for small lengths large dia suction piping.
I feel expansion joint is better to use in place of springs(specially in such examples as suction piping of cooling tower pumps)in non hazardous fluids
Best regards