Search function cannot filter by special character (~, *, #, @, etc) in Who field.

java.lang.IllegalArgumentException: Invalid search query found in specified search.
    at com.atlassian.confluence.search.v2.lucene.LuceneSearchManager.search(LuceneSearchManager.java:76) 
caused by: java.lang.IllegalArgumentException: org.apache.lucene.queryParser.ParseException: Cannot parse '~': Encountered "~" at line 1, column 0. Was expecting one of: <NOT> ... "+" ... "-" ... "(" ... "*" ... <QUOTED> ... <TERM> ... <PREFIXTERM> ... <WILDTERM> ... "[" ... "{" ... <NUMBER> ... 
    at com.atlassian.confluence.search.v2.lucene.mapper.TextFieldQueryMapper.convertToLuceneQuery(TextFieldQueryMapper.java:49) 
caused by: org.apache.lucene.queryParser.ParseException: Cannot parse '~': Encountered "~" at line 1, column 0. Was expecting one of: <NOT> ... "+" ... "-" ... "(" ... "*" ... <QUOTED> ... <TERM> ... <PREFIXTERM> ... <WILDTERM> ... "[" ... "{" ... <NUMBER> ... 
    at org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:150) 
Stack Trace:[hide]
java.lang.IllegalArgumentException: Invalid search query found in specified search.
	at com.atlassian.confluence.search.v2.lucene.LuceneSearchManager.search(LuceneSearchManager.java:76)
	at com.atlassian.confluence.search.actions.SearchSiteAction.exactUsernameSearch(SearchSiteAction.java:339)
	at com.atlassian.confluence.search.actions.SearchSiteAction.getContributors(SearchSiteAction.java:269)
	at com.atlassian.confluence.search.actions.SearchSiteAction.validate(SearchSiteAction.java:170)
	at com.opensymphony.xwork.interceptor.DefaultWorkflowInterceptor.intercept(DefaultWorkflowInterceptor.java:44)
...
...
...
	at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.IllegalArgumentException: org.apache.lucene.queryParser.ParseException: Cannot parse '~': Encountered "~" at line 1, column 0.
Was expecting one of:
    <NOT> ...
    "+" ...
    "-" ...
    "(" ...
    "*" ...
    <QUOTED> ...
    <TERM> ...
    <PREFIXTERM> ...
    <WILDTERM> ...
    "[" ...
    "{" ...
    <NUMBER> ...
    
	at com.atlassian.confluence.search.v2.lucene.mapper.TextFieldQueryMapper.convertToLuceneQuery(TextFieldQueryMapper.java:49)
	at com.atlassian.confluence.search.v2.lucene.mapper.TextFieldQueryMapper.convertToLuceneQuery(TextFieldQueryMapper.java:15)
	at com.atlassian.confluence.search.v2.lucene.DelegatingLuceneSearchMapper.convertToLuceneQuery(DelegatingLuceneSearchMapper.java:30)
	at com.atlassian.confluence.search.v2.lucene.mapper.BooleanQueryMapper.addSubQueries(BooleanQueryMapper.java:43)
	at com.atlassian.confluence.search.v2.lucene.mapper.BooleanQueryMapper.convertToLuceneQuery(BooleanQueryMapper.java:29)
	at com.atlassian.confluence.search.v2.lucene.DelegatingLuceneSearchMapper.convertToLuceneQuery(DelegatingLuceneSearchMapper.java:30)
	at com.atlassian.confluence.search.v2.lucene.LuceneSearchManager.search(LuceneSearchManager.java:52)
	... 159 more
Caused by: org.apache.lucene.queryParser.ParseException: Cannot parse '~': Encountered "~" at line 1, column 0.
Was expecting one of:
    <NOT> ...
    "+" ...
    "-" ...
    "(" ...
    "*" ...
    <QUOTED> ...
    <TERM> ...
    <PREFIXTERM> ...
    <WILDTERM> ...
    "[" ...
    "{" ...
    <NUMBER> ...
    
	at org.apache.lucene.queryParser.QueryParser.parse(QueryParser.java:150)
	at com.atlassian.confluence.search.v2.lucene.mapper.TextFieldQueryMapper.convertToLuceneQuery(TextFieldQueryMapper.java:45)
	... 165 more