Improve Elastic Search tokenizer/analyzer

[mihaidma]

If I load in the system the seneca and seneca-postgres-store plugins metadata:

• searching for senec doesn't match anything,
• searching for seneca matches both module names,
• searching for seneca-postgres matches both module names. It actually searches for all modules containing seneca and postgres,
• searching for seneca-postg finds both plugins (they are found by the seneca search term). Searching only postg finds nothing. Doing seneca-postg search on the live site finds:

Prerequisite for: #123

To have an autocomplete/search-as-you-type search it can be enhanced with an autocomplete analyzer at index time and a standard analyzer at search time, 2-8 letters Edge ngram for terms.