Failed to execute the Index

We are getting this below error when every we try to reindex .

application.log.2019-09-25:[2019-09-25 05:51:09,317][DEBUG][action.index ] [atlspres1] failed to execute [index {[partner_location][com.tuo.customer.model.customer.PartnerLocationEntity][1275821], source[{"id":"1275821","legalName":"TEST - CUSTOM FREEDOM RATES","partnerLocationCode":"TESTFCM","lastUpdatedDate":"2019-09-25T05:51:09.262Z","partnerLocation":{"partner_account":{"PartnerAccountCode":"TESTFGM-A","PartnerAccountName":"TESTFGM Internal testing account test","PartnerAccount":{"address":{"city":"Vancouver","country":"MISC-COUNTRY-CA","address":"1234 Fake Fake","postalCode":"V7C1A1"},"contact":{"firstName":"ContactJoe","lastName":"ContactJoe","refId":"TU-ACCOUNTCONTACT-2444851"}}}},"partner_location":[{"address":{"city":"Rich","country":"MISC-COUNTRY-CA","address":"61 Road","postalCode":"V6Y 2U2"},"contact":{"firstName":"Digital","lastName":"Platforms Test","refId":"TU-PESON-2657801","phone":[{"number":"6042888769900"}],"emails":[{"email":"joo@tuo.com"}]}}]}

please also paste the surrounding log lines, as the reason is still missing here.

Also, please share the response from that index request, as that would help a lot.

So far, the response only contains the original document, but no reason why indexing failed (that might be part of the following stack trace in the logs).