Lps 31348 mail index

Hi Ray!

This is one of the 6.1.30 issues that should be solved, so here I send you a PR.

After some findings I saw that Lucene 3.5 changed some Analyzers/Tokenizers and was affecting email searching: http://lucene.472066.n3.nabble.com/StandardAnalyzer-and-Email-Addresses-td3751058.html

For testing, instead of using Advanced search, like LPS says, just use the right panel (Keywords), because left Advanced search seems broken (http://issues.liferay.com/browse/LPS-35699). In ee-6.1.x can be tested fine anyway.

There is a workaround for using Advanced search but perhaps is too complicated for only testing a single line.

Thanks!