Manage analyzer settings in Elasticsearch index

There are different types of settings that can be done in an Elasticsearch index. One among them is setting up our analyzers for a particular index.

Let us discuss on how to add the list of analyzers to be used by fields in a type.

Add analyzer to index using RESTFul service

PUT  http://localhost:9200/simplyjava/_settings {

      "analysis": {

                 "filter": {

                          "my_snowball_filter": {

                              "type" : "snowball",

                              "language" : "English"

                          },

                          "my_synonym_filter": {

                            "type": "synonym",

                        "synonyms_path": "my_synonym_file.txt"

                           }

                        },

                           "tokenizer" : {

                            "comma" : {

                                   "type" : "pattern",

                                   "pattern" : ","

                           }

                        },

                        "analyzer": { "a1" : {

                              "type":"custom",

                              "tokenizer": "comma",

                              "filter": ["lowercase", "my_synonym_filter"," my_snowball_filter "]

                        }

                }                                               

          }

       }

Add settings using Java API

The name-value pairs that are used in above rest call can be built as a json object using json builder. This json object can be passed in the java API call.

XContentBuilder settingsBuilder;

try {

                                         settingsBuilder = XContentFactory.jsonBuilder()

                                                                       .startObject()

                                                                           .startObject("analysis")

                                                                                .startObject("filter")

                                                                                  .startObject("my_synonym_filter")

                                                                                  .field("type","synonym")

                                                                                  .field("synonyms_path","my_synonym_file.txt")

                                                                             .endObject()

                                                                       .endObject()

                                                                       .startObject("tokenizer")

                                                                            .startObject("comma")

                                                                               .field("type","pattern")

                                                                               .field("pattern",",")

                                                                            .endObject()

                                                                       .endObject()

                                                                .startObject("analyzer")

                                                                    .startObject("a1")

                                                                       .field("type","custom")

                                                                       .field("tokenizer","comma")

                  .array("filter","lowercase","my_snowball_filter","my_synonym_filter")

                                          .endObject()

                                       .endObject()

                             .endObject()

                         .endObject();                                                            

            client.admin().indices().prepareCreate("simplyjava1").setSettings(settingsBuilder).get();

} catch (IOException e) {

e.printStackTrace();

}

The above piece of code will create index as well as map the settings to the created index.

There is a variety of analyzers available in Elasticsearch. We will be discussing that in the upcoming topics.

Use the following script to view the settings that have been created from executing the snippet.

GET  http://localhost:9200/simplyjava/_settings

Note:

•        Settings can be updated only when the index is closed, so make sure you close the index before updating it using REST service. Reopen the index once the settings are updated.
•       Make sure all the files defined in the analyzers are present in config folder of elastic search server, before executing the settings.

 Thanks !! Meet you soon with next post !!