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If in server config mysql has autocommit = 0, then wikijs fails with locks like this:
```
2020-10-30T12:56:51.725Z [JOB] error: Rebuilding page tree: [ FAILED ]
2020-10-30T12:56:51.726Z [JOB] error: truncate `pageTree` - Lock wait timeout exceeded; try restarting transaction
```

For building suggest in elasticsearch, the safeContent field will be splitted into arrays. If the page is renamed or moved, the server will throw error: "Cannot read property 'split' of Undefined", and the index will be broken. Here two lines are added to fix this issue.

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* Feature: Custom configuration for elasticsearch

For better search results especially in Chinese, which the standard token analyzer may not work well.

* Set default analyzer in settings when building index

* Remove dangling comma

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* - Modify elastic settings
- Add tags field to index
- Modify elastic search query
- Remove empty entities from build suggests list

* Fix map parser error

* - Fix broken drawio svg diagram (rtl issue)

* - Restore the spaces in objects to respect the project formatting rules.
- Omit explanation line

This adds cookieEncryptionKeyString configuration in the Azure AD
authentication module.  It represents an array of cookie encryption
strings and enables workaround for SameSite cookies.

Fix spelling of "superscript"
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When using inline math ($e^{-x^2}$) the curly braces are interpreted as
attributes by markdown-it-attrs. Since most of the times they are not
valid attributes they simply get removed.

This patch escapes the curly braces (the default attribute delimiter),
fixing the KaTeX rendering errors.

It would be nice to simply skip that rule for `katex_inline` block types
but as far as I know markdown-it-attrs doesn't have such an option.

Fixes #1581

The ingress.hostname entry listed in the README is erroneous and not used in the ingress.yaml file.

This change corrects the documentation to correctly refer to ingress.hosts and list the default value as given in values.yaml.

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+ Remove duplicated await
+ Replace some legacy codes with ES6
+ Fix some of eslint problems

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