Empty "merged" fields in `github2_pull_request` index
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- Shell
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- No merged PRs in 30d
Description
The `github2_pull_request` index (which an alias) is not coherent, so it is not possible to show all the data for pull requests. As an example, the following fields are not filled for all the documents:
* pull_merged
* pull_merged_at
So, when using the index, _it is not possible to show all the comments_ (both general and line comments) _for merged pull requests_. Find below an example of the analysis of this [pull request ](https://github.com/angular/components/pull/26710)

This behavior has been seen in `grimoirelab/grimoirelab:0.7.1`
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