Add joining queries index page (#8088) (#8112)

_query-dsl/joining/index.md

@@ -0,0 +1,18 @@
+---
+layout: default
+title: Joining queries
+has_children: true
+nav_order: 55
+---
+
+# Joining queries
+
+OpenSearch is a distributed system in which data is spread across multiple nodes. Thus, running a SQL-like JOIN operation in OpenSearch is resource intensive. As an alternative, OpenSearch provides the following queries that perform join operations and are optimized for scaling across multiple nodes:
+
+- `nested` queries: Act as wrappers for other queries to search [nested]({{site.url}}{{site.baseurl}}/field-types/supported-field-types/nested/) fields. The nested field objects are searched as though they were indexed as separate documents.
+- `has_child` queries: Search for parent documents whose child documents match the query.
+- `has_parent` queries: Search for child documents whose parent documents match the query.
+- `parent_id` queries: A [join]({{site.url}}{{site.baseurl}}/field-types/supported-field-types/nested/) field type establishes a parent/child relationship between documents in the same index. `parent_id` queries search for child documents that are joined to a specific parent document. 
+
+If [`search.allow_expensive_queries`]({{site.url}}{{site.baseurl}}/query-dsl/index/#expensive-queries) is set to `false`, then joining queries are not executed.
+{: .important}

_query-dsl/term/fuzzy.md

@@ -89,5 +89,5 @@ Parameter | Data type | Description
 Specifying a large value in `max_expansions` can lead to poor performance, especially if `prefix_length` is set to `0`, because of the large number of variations of the word that OpenSearch tries to match.
 {: .warning}
 
-If [`search.allow_expensive_queries`]({{site.url}}{{site.baseurl}}/query-dsl/index/#expensive-queries) is set to `false`, fuzzy queries are not run.
+If [`search.allow_expensive_queries`]({{site.url}}{{site.baseurl}}/query-dsl/index/#expensive-queries) is set to `false`, then fuzzy queries are not executed.
 {: .important}

_query-dsl/term/prefix.md

@@ -66,5 +66,5 @@ Parameter | Data type | Description
 `case_insensitive` | Boolean | If `true`, allows case-insensitive matching of the value with the indexed field values. Default is `false` (case sensitivity is determined by the field's mapping).
 `rewrite` | String | Determines how OpenSearch rewrites and scores multi-term queries. Valid values are `constant_score`, `scoring_boolean`, `constant_score_boolean`, `top_terms_N`, `top_terms_boost_N`, and `top_terms_blended_freqs_N`. Default is `constant_score`.
 
-If [`search.allow_expensive_queries`]({{site.url}}{{site.baseurl}}/query-dsl/index/#expensive-queries) is set to `false`, prefix queries are not run. If `index_prefixes` is enabled, the `search.allow_expensive_queries` setting is ignored and an optimized query is built and run.
+If [`search.allow_expensive_queries`]({{site.url}}{{site.baseurl}}/query-dsl/index/#expensive-queries) is set to `false`, then prefix queries are not executed. If `index_prefixes` is enabled, then the `search.allow_expensive_queries` setting is ignored and an optimized query is built and run.
 {: .important}

_query-dsl/term/range.md

@@ -217,5 +217,5 @@ Parameter | Data type | Description
 `boost` | Floating-point | A floating-point value that specifies the weight of this field toward the relevance score. Values above 1.0 increase the field’s relevance. Values between 0.0 and 1.0 decrease the field’s relevance. Default is 1.0.
 `time_zone` | String | The time zone used to convert [`date`]({{site.url}}{{site.baseurl}}/opensearch/supported-field-types/date/) values to UTC in the query. Valid values are ISO 8601 [UTC offsets](https://en.wikipedia.org/wiki/List_of_UTC_offsets) and [IANA time zone IDs](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones). For more information, see [Time zone](#time-zone).
 
-If [`search.allow_expensive_queries`]({{site.url}}{{site.baseurl}}/query-dsl/index/#expensive-queries) is set to `false`, range queries on [`text`]({{site.url}}{{site.baseurl}}/opensearch/supported-field-types/text/) and [`keyword`]({{site.url}}{{site.baseurl}}/opensearch/supported-field-types/keyword/) fields are not run.
+If [`search.allow_expensive_queries`]({{site.url}}{{site.baseurl}}/query-dsl/index/#expensive-queries) is set to `false`, then range queries on [`text`]({{site.url}}{{site.baseurl}}/opensearch/supported-field-types/text/) and [`keyword`]({{site.url}}{{site.baseurl}}/opensearch/supported-field-types/keyword/) fields are not executed.
 {: .important}

_query-dsl/term/regexp.md

@@ -61,5 +61,5 @@ Parameter | Data type | Description
 `max_determinized_states` | Integer | Lucene converts a regular expression to an automaton with a number of determinized states. This parameter specifies the maximum number of automaton states the query requires. Use this parameter to prevent high resource consumption. To run complex regular expressions, you may need to increase the value of this parameter. Default is 10,000.
 `rewrite` | String | Determines how OpenSearch rewrites and scores multi-term queries. Valid values are `constant_score`, `scoring_boolean`, `constant_score_boolean`, `top_terms_N`, `top_terms_boost_N`, and `top_terms_blended_freqs_N`. Default is `constant_score`.
 
-If [`search.allow_expensive_queries`]({{site.url}}{{site.baseurl}}/query-dsl/index/#expensive-queries) is set to `false`, `regexp` queries are not run.
+If [`search.allow_expensive_queries`]({{site.url}}{{site.baseurl}}/query-dsl/index/#expensive-queries) is set to `false`, then `regexp` queries are not executed.
 {: .important}

_query-dsl/term/wildcard.md

@@ -64,5 +64,5 @@ Parameter | Data type | Description
 `case_insensitive` | Boolean | If `true`, allows case-insensitive matching of the value with the indexed field values. Default is `false` (case sensitivity is determined by the field's mapping).
 `rewrite` | String | Determines how OpenSearch rewrites and scores multi-term queries. Valid values are `constant_score`, `scoring_boolean`, `constant_score_boolean`, `top_terms_N`, `top_terms_boost_N`, and `top_terms_blended_freqs_N`. Default is `constant_score`.
 
-If [`search.allow_expensive_queries`]({{site.url}}{{site.baseurl}}/query-dsl/index/#expensive-queries) is set to `false`, wildcard queries are not run.
+If [`search.allow_expensive_queries`]({{site.url}}{{site.baseurl}}/query-dsl/index/#expensive-queries) is set to `false`, then wildcard queries are not executed.
 {: .important}