Changing the indexing language to be used in your Confluence site may improve the accuracy of Confluence search results, if the majority of the content in your site is in a language other than English.
Confluence supports content indexing in:
Arabic
Brazilian
Chinese
CJK
Czech
Custom Japanese
English (default)
French
German
Greek
Persian
Russian
To configure the indexing language:
Go to > General Configuration then choose Edit.
Select the Indexing Language from the dropdown list in the Formatting and International Settings section.