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Reindex

Via the _reindex endpoint it is possible to reindex one or all indexes with a given query.

Reindex an existing Index

Create an index 'test' with a custom analyzer with the stop word 'guy':

>>> put("/test", {"settings": {"index": {"number_of_shards":1,
...                           "number_of_replicas":0,
...                           "analysis": {"analyzer": {"myan": {"type": "stop", "stopwords": ["guy"]}}}}}})
{"ok":true,"acknowledged":true}

Create the mapping for type 'a' and use the custom analyzer as index analyzer and use a simple search analyzer:

>>> post("/test/a/_mapping", {"a": {"properties": {"name": {"type": "string", "index_analyzer": "myan", "search_analyzer": "simple", "store": "yes"}}}})
{"ok":true,"acknowledged":true}

Add a document:

>>> post("/test/a/1", {"name": "a nice guy"})
{"ok":true,"_index":"test","_type":"a","_id":"1","_version":1}
>>> refresh()
{...}

Querying for a non stop word term delivers a result:

>>> post("/test/a/_search?pretty", {"query": {"text": {"name": "nice"}}})
{
  ...
  "hits" : {
    "total" : 1,
    ...
}

Querying for a stop word delivers no results:

>>> post("/test/a/_search?pretty", {"query": {"text": {"name": "guy"}}})
{
  ...
  "hits" : {
    "total" : 0,
    ...
}

Now update the stop words configuration. To update settings the index has to be closed first and then reopened:

>>> post("/test/_close", {})
{"ok":true,"acknowledged":true}
>>> put("/test/_settings", {"analysis": {"analyzer": {"myan": {"type": "stop", "stopwords": ["nice"]}}}})
{"ok":true,"acknowledged":true}
>>> post("/test/_open", {})
{"ok":true,"acknowledged":true}
>>> refresh()
{...}

As the index has not been reindexed yet, the query for 'nice' still delivers a result:

>>> post("/test/a/_search?pretty", {"query": {"text": {"name": "nice"}}})
{
  ...
  "hits" : {
    "total" : 1,
    ...
}

Now do a reindex on the index 'test':

>>> post("/test/_reindex", {})
{"writes":[..."succeeded":1...],"total":0,"succeeded":0,"failed":0,"_shards":{"total":1,"successful":1,"failed":0}}
>>> refresh()
{...}

No more result when querying for the new stop word 'nice':

>>> post("/test/a/_search?pretty", {"query": {"text": {"name": "nice"}}})
{
  ...
  "hits" : {
    "total" : 0,
    ...
}

The removed stop word 'guy' now delivers a result:

>>> post("/test/a/_search?pretty", {"query": {"text": {"name": "guy"}}})
{
  ...
  "hits" : {
    "total" : 1,
    ...
}