After looking into some compass articles, looks like this is a know issue happening with multiple people but don’t see any perfect root cause here, probably other experts can comment more but what I found is you can avoid this and continue aggregation with below configuration, please try adding below to application xml
<entry key="retryableErrorsOnAgg">
<value>
<List>
<String>javax.net.ssl.SSLException: Connection reset</String>
</List>
</value>
</entry>