Change 223765 had a related patch set uploaded (by Phoenix303):
Use AND operator to search messages containing all words in the search string.

https://gerrit.wikimedia.org/r/223765

Searching any word in the string is the default behaviour which is already supported in the product.

Change 226289 had a related patch set uploaded (by Phoenix303):
Search messages containing exact search phrase.

https://gerrit.wikimedia.org/r/226289

This works ok at http://translation-search.wmflabs.org/wiki/Special:SearchTranslations ; we currently think we should probably

• put the OR/AND/phrase dropdown next to the search bar with text as in http://catalog.loc.gov/vwebv/searchAdvanced ;
• default to OR search without options as currently done, show the dropdown if there are "many" results;
• perhaps display some message to explain the appearance of the dropdown.

With some more testing and digging deeper into the features of ElasticSearch, I have found few conclusions we made earlier not to be completely true.

• ElasticSearch does not score phrase matches higher( not found any document to support ), but scores AND higher than OR. In other words, even with the default 'OR' search ES would score documents which match all the query words high. However, this is only true for each shard. ES does not score based on the entire index (globally) Ref.
• An example in translatewiki.net and with the offset=150.

Change 226289 abandoned by Phoenix303:
Search messages containing the exact search phrase.

Reason:
Not required anymore.

https://gerrit.wikimedia.org/r/226289

Change 223765 merged by jenkins-bot:
Support search for all words in the search string.

https://gerrit.wikimedia.org/r/223765