# \`-Infinity\` Scores during rolling upgrade

**URL:** <https://discuss.elastic.co/t/infinity-scores-during-rolling-upgrade/257667>\
**Category:** Elasticsearch\
**Created:** [December 4, 2020, 2:35pm UTC](https://discuss.elastic.co/t/infinity-scores-during-rolling-upgrade/257667 "2020-12-04T14:35:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ggdd](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/ggdd/32/80282_2.png) [@ggdd](https://discuss.elastic.co/u/ggdd)\
**Post date:** [December 4, 2020, 2:35pm UTC](https://discuss.elastic.co/t/infinity-scores-during-rolling-upgrade/257667/1 "2020-12-04T14:35:57Z")

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Hi,

We are performing a rolling upgrade from ES6 to ES7 and we have 3 types of nodes:

- Coordinators
- Data-only
- Master eligible-only

As recommended, we start the upgrade with the non-master-eligible nodes, in our case the coordinator nodes.

Once the coordinator nodes are upgraded, we start seeing scroll responses containing `-Infinity` scores instead of the expected `null`.

This breaks golang clients because they can't parse that value, but we wanted to know why these `-Infinity` scores are appearing.

The same requests going directly to the `data` nodes have the expected `null` scores.

Sort is set to `_doc` and when we remove that, the scores no longer are shown as `-Infinity`.

Setting `explain: true` doesn't provide much information, as the explained scores look normal but the `_score` fields still display `-Infinity`.

Note that the upgrade is from 6.8.4 to 7.9.1, so at this point in time, the coordinator nodes are using 7.9.1 and the data nodes use 6.8.4.

Is this a known issue? Should we take a different upgrade approach?

Thanks,  
Giorgos

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [January 1, 2021, 2:36pm UTC](https://discuss.elastic.co/t/infinity-scores-during-rolling-upgrade/257667/2 "2021-01-01T14:36:14Z")

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Closed on January 1, 2021, 2:36pm UTC

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