I have the following Ruby code to define my index:
self.client.indices.create index: self.index,
body: {
settings: {
analysis: {
filter: {
ngram: {
type: 'nGram',
min_gram: 2,
max_gram: 25
}
},
analyzer: {
ngram: {
tokenizer: 'whitespace',
filter: ['lowercase', 'stop', 'ngram'],
type: 'custom'
},
ngram_search: {
tokenizer: 'whitespace',
filter: ['lowercase', 'stop'],
type: 'custom'
}
}
}
},
mappings: {
search_variable: {
properties: {
"name" => {
"type" => "string",
"index" => "not_analyzed"
},
.... <some items removed here for brevity>,
"node_id" => {
"type" => "integer",
"index" => "not_analyzed"
},
"search_text" => {
"type" => "multi_field",
"fields" => {
"search_text" => {"type" => "string",
"analyzer" => "ngram",
"search_analyzer" => "ngram_search"},
"whole_words" => {"type" => "string",
"analyzer" => "ngram_search"}
}
}
}
}
}
}
This code is acknowledged and created successfully.
I can confirm this with a get request to localhost:9200/<index_name> which shows the settings.
I would then have expected to be able to search search_text and search_text.whole_words, but it returns no hits for search_text.whole_words.
Here is my search query:
search_query = {
index: index,
body: {
_source: {
exclude: ["search_text", "survey_id", "ancestor_ids", "node_type"]
},
query: {
:bool => {
:filter => {
:term => {"survey_id" => 12}
},
:must => {
:match => {
#"search_text" => {"query" => "ford", "operator" => "and"},
"search_text.whole_words" => {"query" => "ford", "operator" => "and"}
},
},
:must_not => {
:match => {
"search_text" => {"query" => "", "operator" => "or"}}
}
}
}
}
}
It returns no results and I can't understand why.
Basically, at the end, my requirement is that I want to be able to prioritise whole words.