Briefly, this error occurs when Elasticsearch is trying to ignore a river, but no river type is provided. Rivers were used to import data from external systems into Elasticsearch, but they have been deprecated since version 5.0.0. To resolve this issue, you can either specify the river type if you’re using an older version of Elasticsearch, or better yet, upgrade to a newer version and use Logstash or Beats for data import, as rivers are no longer supported.
This guide will help you check for common problems that cause the log ” no river type provided for [{}]; ignoring… ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: routing.
Overview
In Elasticsearch, routing refers to document routing. When you index a document, Elasticsearch will determine which shard the document should be routed to for indexing.
The shard is selected based on the following formula:
shard = hash(_routing) % number_of_primary_shards
Where the default value of _routing is _id.
It is important to know which shard the document is routed to, because Elasticsearch will need to determine where to find that document later on for document retrieval requests.
Examples
In twitter index with 2 primary shards, the document with _id equal to “440” gets routed to the shard number:
shard = hash( 440 ) % 2
PUT twitter/_doc/440
{
...
}Notes and good things to know
- In order to improve search speed, you can create custom routing. For example, you can enable custom routing that will ensure that only a single shard will be queried (the shard that contains your data).
- To create custom routing in Elasticsearch, you will need to configure and define that not all routing will be completed by default settings. ( v <= 5.0)
PUT my_index/customer/_mapping
{
"order":{
"_routing":{
"required":true
}
}
}- This will ensure that every document in the “customer” type must specify a custom routing. For Elasticsearch version 6 or above you will need to update the same mapping as:
PUT my_index/_mapping
{
"order":{
"_routing":{
"required":true
}
}
}Log Context
Log “no river type provided for [{}]; ignoring…” classname is RiversRouter.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
logger.debug("{}/{}/_meta document found."; riverIndexName; mappingType);
String riverType = XContentMapValues.nodeStringValue(getResponse.getSourceAsMap().get("type"); null);
if (riverType == null) {
logger.warn("no river type provided for [{}]; ignoring..."; riverIndexName);
} else {
routingBuilder.put(new RiverRouting(new RiverName(riverType; mappingType); null));
dirty = true;
}
} else {
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