Configure Tokenizers and Analyzers for easy searching

OpenSearch
1

I’m in the process of migrating an Elasticsearch index into Opensearch. I’m having issues with getting my index search to get me results.

In Elasticsearch, my index is configured as such

{
	"settings": {
		"analysis": {
			"analyzer": {
				"account_analyzer": {
					"tokenizer": "account_tokenizer"
				}
			},
			"tokenizer": {
				"account_tokenizer": {
					"token_chars": ["digit"],
					"type": "ngram",
					"min_gram": "3",
					"max_gram": "3"
				}
			}
		}
	},
	"mappings": {
		"properties": {
			"accounts": {
				"properties": {
					"accountNumber": {
						"type": "text",
						"analyzer": "account_analyzer"
					}
				}
			}
		}
	}
}

The index in OpenSearch is configured as such:

{
	"settings": {
		"analysis": {
			"analyzer": {
				"account_analyzer": {
					"type": "custom",
					"tokenizer": "account_tokenizer"
				}
			},
			"tokenizer": {
				"account_tokenizer": {
					"token_chars": ["digit"],
					"type": "ngram",
					"min_gram": "3",
					"max_gram": "3"
				}
			}
		}
	},
	"mappings": {
		"properties": {
			"accounts": {
				"type": "nested",
				"properties": {
					"accountNumber": {
						"type": "text",
						"analyzer": "account_analyzer"
					}
				}
			}
		}
	}
}

When I execute the query in Elasticsearch, I get results back. When I execute the query in OpenSearch, I get 0 hits from OpenSearch.

{
	"query": {
		"bool": {
			"must": [
				{
					"match": {
						"accounts.accountNumber": "12345678"
					}
				},
				{
					"match": {
						"accounts.accountLength": 8
					}
				}
			]
		}
	}
}

The account number I’m looking for in the index is saved as 1234####. Coming from Elasticsearch, the ngram tokenizer is supposed to group the characters in the index record and search based on groups indicated by the min_gram and max_gram configuration options. Does this feature translate into OpenSearch. How would I correctly configure the feature in OpenSearch? What plugins would I need to leverage to get the expected functionality?

2

For extra context, I’m running the docker container with the following command:

docker run -e discovery.type=single-node -e DISABLE_INSTALL_DEMO_CONFIG=true -e DISABLE_SECURITY_PLUGIN=true opensearchproject/opensearch:1.2.0
3

We can mark this one as solved. I needed to insert the records with ?refresh before I could search them.