Hi,
I am creating a plugin that analyzes document being indexed and based on
the analysis it adds new fields to it. It is done from a root mapper and it
works similarly as the attachment mapper.
I need to use the root mapper because I need the whole document for
analysis, not individual fields. I also don't have a fixed predefined set
of fields that can be generated.
I'd like to ask what is the correct way of updating the mapping in this
scenario.
If I don't update the mapping then I'm getting a NPE:
Caused by: java.lang.NullPointerException
org.elasticsearch.index.fieldvisitor.FieldsVisitor.postProcess(FieldsVisitor.java:70)
org.elasticsearch.index.get.ShardGetService.innerGetLoadFromStoredFields(ShardGetService.java:333)
org.elasticsearch.index.get.ShardGetService.innerGet(ShardGetService.java:212)
org.elasticsearch.index.get.ShardGetService.get(ShardGetService.java:106)
org.elasticsearch.action.get.TransportGetAction.shardOperation(TransportGetAction.java:109)
org.elasticsearch.action.get.TransportGetAction.shardOperation(TransportGetAction.java:43)
That's because there is no FieldMapper for the newly added field.
I can add the field mapper this
way: context.docMapper().addFieldMappers(ImmutableSet.of(field.mapper)) and
then it seems to work. No NPE, no warnings in the log.
However, to create the field mapper, I need a Mapper.BuilderContext, so
that I can do e.g. field.mapper
= MapperBuilders.stringField(field.name()).build(builderContext));
This seems to be a problem because the BuilderContext is available only
from my root mapper's Builder. I pass the BuilderContext to my root mapper
which then uses it to create the field mappers. But this seems hacky/wrong.
What would be the correct approach? Will the mapping be otherwise updated
somehow by Elasticsearch in this case? Or how exactly should I go about
implementing my root mapper's toXContent() method?
You can see the mapper
here:
https://github.com/sindicetech/smartindexing/blob/issue-1/cogito-elasticsearch/src/main/java/net/expertsystem/connector/elasticsearch/index/CogitoMapper.java
(work in progress/playground).
Thanks,
Jakub
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