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https://issues.apache.org/jira/browse/CALCITE-6498?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Grein updated CALCITE-6498:
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Summary: Elasticsearch multi-field mappings do not work (was:
Elasticsearch nested mappings do not work)
> Elasticsearch multi-field mappings do not work
> ----------------------------------------------
>
> Key: CALCITE-6498
> URL: https://issues.apache.org/jira/browse/CALCITE-6498
> Project: Calcite
> Issue Type: Bug
> Components: elasticsearch-adapter
> Reporter: Tim Grein
> Assignee: Tim Grein
> Priority: Major
> Fix For: 1.38.0
>
>
> _EmbeddedElasticsearchPolicy#_
> _applyMapping_ tries to apply a nested mapping by adding another _properties_
> field inside a parent field mapping. In Elasticsearch you need to use
> _fields_ rather than _properties_ for a nested mapping to work.
>
> I've tested this with ES 7 and ES 6 (only including ES 7 example here in the
> issue description; for ES 6 you need to wrap everything under "mappings" in
> "_doc"):
> ES 7:
> {code:java}
> PUT /some_index
> {
> "mappings": {
> "properties": {
> "some_field": {
> "type": "text",
> "properties": {
> "keyword": {
> "type": "keyword"
> }
> }
> }
> }
> }
> }{code}
> will lead to the following error:
> {code:java}
> {
> "error" : {
> "root_cause" : [
> {
> "type" : "mapper_parsing_exception",
> "reason" : "Mapping definition for [some_field] has unsupported
> parameters: [properties : {keyword={type=keyword}}]"
> }
> ],
> "type" : "mapper_parsing_exception",
> "reason" : "Failed to parse mapping [_doc]: Mapping definition for
> [some_field] has unsupported parameters: [properties :
> {keyword={type=keyword}}]",
> "caused_by" : {
> "type" : "mapper_parsing_exception",
> "reason" : "Mapping definition for [some_field] has unsupported
> parameters: [properties : {keyword={type=keyword}}]"
> }
> },
> "status" : 400
> } {code}
>
> Successful request:
> {code:java}
> PUT /some_index
> {
> "mappings": {
> "properties": {
> "some_field": {
> "type": "text",
> "fields": {
> "keyword": {
> "type": "keyword"
> }
> }
> }
> }
> }
> } {code}
> You'll encounter this error also, if you adapt the test data in
> _ElasticsearchAdapterTest_ to include nested fields:
> {code:java}
> @BeforeAll
> public static void setupInstance() throws Exception {
> // "city.keyword" is a nested field with type "keyword"
> final Map<String, String> mapping =
> ImmutableMap.of("city", "text", "city.keyword", "keyword", "state",
> "keyword", "pop", "long"); {code}
> Error:
> {code:java}
> {...
> {"type":"mapper_parsing_exception","reason":"unknown parameter [properties]
> on mapper [city] of type [text]"}
> ...} {code}
> Looking at _ElasticsearchJson#visitMappingProperties_ I assume this will lead
> to a similar issue, which I'll double-check.
> This is related to https://issues.apache.org/jira/browse/CALCITE-3027 as you
> want to detect, if you perform a "LIKE" operator on a purely "text" mapped
> field, which will lead to weird semantics ("text" mapped fields are
> analyzed/broken up into several tokens), if you do not prevent it. Usually
> you have a nested "keyword" mapping for a "text" field, which you can
> fallback to. So this is rather important to work correctly overall and in the
> tests.
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