Selectively turn off stop words in Elastic Search - elasticsearch

Question

So I would like to turn off stop word filtering on the username, title, and tags fields but not the description field.
As you can imagine I do not want to filter out a result called the best but I do want to stop the from affecting the score if it is in the description field (search the on GitHub if you want an example).
Now #Javanna says ( Is there a way to "escape" ElasticSearch stop words? ):
In your case I would disable stopwords for that specific field rather than modifying the stopword list, but you could do the latter too if you wish to.
Failing to provide an example so I searched around and tried the common query: http://www.elasticsearch.org/blog/stop-stopping-stop-words-a-look-at-common-terms-query/ which didn't work for me either.
So I searched for specifically stopping the filtering stop words however the closest I have come to is stopping it index wide: Can I customize Elastic Search to use my own Stop Word list? by attacking the analyzer directly, or failing that the documentation hints at making my own analyzer :/.
What is the best way selectively disable stop words on certain fields?

Answer 1

I think you already know what to do, which would be to customize your analyzers for certain fields. From what I understand you did not manage to create a valid syntax example for that. This is what we used in a project, I hope that this example points you in the right direction:
{
:settings => {
:analysis => {
:analyzer => {
:analyzer_umlauts => {
:tokenizer => "standard",
:char_filter => ["filter_umlaut_mapping"],
:filter => ["standard", "lowercase"],
}
},
:char_filter => {
:filter_umlaut_mapping => {
:type => 'mapping',
:mappings_path => es_config_file("char_mapping")
}
}
}
},
:mappings => {
:company => {
:properties => {
[...]
:postal_city => { :type => "string", :analyzer => "analyzer_umlauts", :omit_norms => true, :omit_term_freq_and_positions => true, :include_in_all => false },
}
}
}
}