Question

In my elasticsearch.yml file am trying to implement some mapping where one field belonging to one type is indexed using a different analyzer to the rest.

At present the yaml file has the following structure:

index:
  bookshelf:
    types:
      book:
        mappings:
          title: {analyzer: customAnalyzer}
  analysis:
    analyzer:
      # set standard analyzer with no stop words as the default
      default:
        type: standard
        stopwords: _none_
      # set custom analyser to provide relative search results
      customAnalyzer:
        type: custom
        tokenizer: nGramTokenizer
        filter: [lowercase,stopWordsFilter,asciifolding]
    tokenizer:
      nGramTokenizer:
        type: nGram
        min_gram: 1
        max_gram: 2
    filter:
      nGramFilter:
        type: nGram
        min_gram: 1
        max_gram: 2
      stopWordsFilter:
        type: stop
        stopwords: _none_

This does not apply the custom analyzer to the title field, so I was hoping someone may be able to point me in the right direction for applying custom analyzers to individual fields?

Answer 1

I answered this in the ml:

If you are using Java you don’t have to use an yml file. You can, but you don’t have to.

If you are using Spring, you can have a look at the ES spring factory project:  https://github.com/dadoonet/spring-elasticsearch

If not, there is different ways of creating index and mappings in Java:

1. You can have a look here to see how I’m doing this by reading a json
   mapping file: 
   https://github.com/dadoonet/spring-elasticsearch/blob/master/src/main/java/fr/pilato/spring/elasticsearch/ElasticsearchAbstractClientFactoryBean.java#L616

2. You can also use XContent objects provided by ES to build your
   mappings in Java: 
   https://github.com/dadoonet/rssriver/blob/master/src/test/java/org/elasticsearch/river/rss/RssRiverTest.java#L14

3. Using this object is described here:  https://github.com/dadoonet/rssriver/blob/master/src/test/java/org/elasticsearch/river/rss/AbstractRssRiverTest.java#L98

Adding the mapping as follows:

node .client() .admin () .indices()
 .preparePutMapping ("yourindex" )
 .setType ( "yourtype" )
 .setSource ( mapping ())
 .execute() .actionGet ();

I hope this could help you