[DOCS] Rewrite 'rewrite' parameter docs #42018
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jrodewig
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Pinging @elastic/es-search |
| WARNING: This parameter is for expert users only. Changing the value of this | ||
| parameter can impact search performance and relevance. | ||
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| To improve performance, {es} rewrites the following queries: |
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I am not sure if rewrite happens to improve performance. I think it happens just to break up complex queries into term based queries that Lucene can execute
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| * <<query-dsl-prefix-query, `prefix`>> | ||
| * <<query-dsl-query-string-query, `query_string`>> | ||
| * <<query-dsl-wildcard-query, `wildcard`>> |
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There are other queries as well that get rewritten. For example, regexp, fuzzy, prefix can also be rewritten.
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Thanks @mayya-sharipova. I added these queries with 50505e6.
| In their original form, these queries are expensive. {es} changes the | ||
| original query to a less expensive <<query-dsl-bool-query, `bool` query>>. This | ||
| `bool` query contains a `should` clause and <<query-dsl-term-query, `term` | ||
| query>> for each matching term. |
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I am not sure this is always the case, but may be @jimczi can confirm here. As I understood it, sometimes for constant_score instead of a boolean query, we just use a document bit set. And the rewrite is done by Lucene, not ES
| === Valid values | ||
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| `constant_score` (Default):: | ||
| Automatically uses the `constant_score_boolean` or `scoring_boolean` method, |
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I don't think constant_score uses scoring_boolean
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Thanks @jrodewig. Very nice work, we just to need to clarify several items.
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Thanks so much for your thorough feedback, @mayya-sharipova! I made several changes you suggested with 50505e6:
Please let me know if you see any other needed changes. |
| `constant_score` (Default):: | ||
| Uses the `constant_score_boolean` method for fewer matching terms. Otherwise, | ||
| this method finds all matching terms in sequence and returns matching documents | ||
| using a bit set. |
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Please confirm that this constant_score definition is accurate.
Changes
This is part of #40977, an effort to standardize documentation for query types.
Any and all feedback welcome!
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