Multimatch cross_fields_prefix plugin

This is a plugin for ElasticSearch that allows combining cross_fields and bool_prefix as a new type in a multi_match query.

ElasticSearch example

Like cross_fields, cross_fields_prefix analyzes the query string into individual terms, then looks for each term as a prefix in any of the fields.

{
  "query": {
    "multi_match_plugin" : {
      "query":      "Will Smith",
      "type":       "cross_fields_prefix",
      "fields":     [ "first_name", "last_name" ],
      "operator":   "and"
    }
  }
} 

Is executed as:

+(first_name:will* last_name:will*)
+(first_name:smith* last_name:smith*)

cross_fields_prefix works similar as cross_fields as described here, e.g. term frequencies are blended, and the fuzziness parameter cannot be used.

Adding the plugin

Generate a zip containing the plugin: mvn clean install

Install the plugin: ./bin/elasticsearch-plugin install file://PATH_TO_ZIP

Removing the plugin

./bin/elasticsearch-plugin remove crossfields-prefix

Debugging the plugin

Start ElasticSearch with: ES_JAVA_OPTS=-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005 ./bin/elasticsearch

Create a new remote debugging configuration that attaches to a remote JVM.