Apache Solr Reference Guide Covering Apache Solr 6.0

Constructing a chain at request time
# Executing processors configured in solrconfig.xml as (pre)-processors
curl
"http://localhost:8983/solr/gettingstarted/update/json?processor=remove_blanks,signa
ture&commit=true" -H 'Content-type: application/json' -d '
[
{
"name" : "The Lightning Thief",
"features" : "This is just a test",
"cat" : ["book","hardcover"]
},
{
"name" : "The Lightning Thief",
"features" : "This is just a test",
"cat" : ["book","hardcover"]
}
]'
# Executing processors configured in solrconfig.xml as pre and post processors
curl
"http://localhost:8983/solr/gettingstarted/update/json?processor=remove_blanks&postprocessor=signature&commit=true"
-H 'Content-type: application/json' -d '
[
{
"name" : "The Lightning Thief",
"features" : "This is just a test",
"cat" : ["book","hardcover"]
},
{
"name" : "The Lightning Thief",
"features" : "This is just a test",
"cat" : ["book","hardcover"]
}
]'
In the first example, Solr will dynamically create a chain which has "signature" and "remove_blanks" as
pre-processors to be executed only on the forwarding node where as in the second example, "remove_blanks"
will be executed as a pre-processor and "signature" will be executed on the leader and replicas as a post
processor.
Configuring a custom chain as a default
We can also specify a custom chain to be used by default for all requests sent to specific update handlers
instead of specifying the names in request parameters for each request.
This can be done by adding either "update.chain" or "processor" and "post-processor" as default parameter for a
given path which can be done either via InitParams in SolrConfig or by adding them in a "defaults" section which
is supported by all request handlers.
The following is an actual InitParam defined in the schemaless configuration which applies a custom update
chain to all request handlers starting with "/update/".
Apache Solr Reference Guide 6.0
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