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Full-text index restrictions

This topic introduces the restrictions for full-text indexes. Please read the restrictions very carefully before using the full-text indexes.

Caution

The full-text index feature has been redone in version 3.6.0 and is not compatible with previous versions. If you want to continue to use wildcards, regulars, fuzzy matches, etc., there are 3 ways to do so as follows:

  • Delete the original full-text index, rebuild the full-text index in the new way, and use the new query syntax.
  • Delete the original full-text index and use the native index and string operators directly.
  • Continue to use the previous version of NebulaGraph and its full-text index.

For now, full-text search has the following limitations:

  • Currently, full-text search supports LOOKUP statements only.
  • The full-text index name can contain only numbers, lowercase letters, and underscores.
  • The names of full-text indexes within different graph spaces cannot be duplicated.
  • The query returns 10 records by default. You can use the LIMIT clause to return more records, up to 10,000. You can modify the ElasticSearch parameters to adjust the maximum number of records returned.
  • If there is a full-text index on the tag/edge type, the tag/edge type cannot be deleted or modified.
  • The type of properties must be STRING or FIXED_STRING.
  • Full-text index can not be applied to search multiple tags/edge types.
  • Full-text index can not search properties with value NULL.
  • Altering Elasticsearch indexes is not supported at this time.
  • Modifying the analyzer is not supported. You have to delete the index data and then specify the analyzer when you rebuild the index.
  • Make sure that you start the Elasticsearch cluster and Nebula Graph at the same time. If not, the data writing on the Elasticsearch cluster can be incomplete.
  • It may take a while for Elasticsearch to create indexes. If Nebula Graph warns no index is found, you can check the status of the indexing task.
  • NebulaGraph clusters deployed with K8s do not have native support for the full-text search feature. However, you can manually deploy the feature yourself.
Last update: October 24, 2023