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Added documentation for changing the default values of HNSW hyper parameters in k-NN plugin (#6272) 

* Added documentation for changing the default values of HNSW hyperparameters in k-NN plugin

Signed-off-by: Navneet Verma <navneev@amazon.com>

* Update _search-plugins/knn/knn-index.md

Co-authored-by: Nathan Bower <nbower@amazon.com>
Signed-off-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>

---------

Signed-off-by: Navneet Verma <navneev@amazon.com>
Signed-off-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>
Co-authored-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>
Co-authored-by: Nathan Bower <nbower@amazon.com>
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@ -39,12 +39,15 @@ Method name | Requires training | Supported spaces | Description
Parameter name | Required | Default | Updatable | Description
:--- | :--- | :--- | :--- | :---
`ef_construction` | false | 512 | false | The size of the dynamic list used during k-NN graph creation. Higher values lead to a more accurate graph but slower indexing speed.
`ef_construction` | false | 100 | false | The size of the dynamic list used during k-NN graph creation. Higher values result in a more accurate graph but slower indexing speed.
`m` | false | 16 | false | The number of bidirectional links that the plugin creates for each new element. Increasing and decreasing this value can have a large impact on memory consumption. Keep this value between 2 and 100.
For nmslib, *ef_search* is set in the [index settings](#index-settings).
{: .note}
An index created in OpenSearch version 2.11 or earlier will still use the old `ef_construction` value (`512`).
{: .note}
### Supported faiss methods
Method name | Requires training | Supported spaces | Description
@ -59,11 +62,14 @@ For hnsw, "innerproduct" is not available when PQ is used.
Parameter name | Required | Default | Updatable | Description
:--- | :--- | :--- | :--- | :---
`ef_search` | false | 512 | false | The size of the dynamic list used during k-NN searches. Higher values lead to more accurate but slower searches.
`ef_construction` | false | 512 | false | The size of the dynamic list used during k-NN graph creation. Higher values lead to a more accurate graph but slower indexing speed.
`ef_search` | false | 100 | false | The size of the dynamic list used during k-NN searches. Higher values result in more accurate but slower searches.
`ef_construction` | false | 100 | false | The size of the dynamic list used during k-NN graph creation. Higher values result in a more accurate graph but slower indexing speed.
`m` | false | 16 | false | The number of bidirectional links that the plugin creates for each new element. Increasing and decreasing this value can have a large impact on memory consumption. Keep this value between 2 and 100.
`encoder` | false | flat | false | Encoder definition for encoding vectors. Encoders can reduce the memory footprint of your index, at the expense of search accuracy.
An index created in OpenSearch version 2.11 or earlier will still use the old `ef_construction` and `ef_search` values (`512`).
{: .note}
#### IVF parameters
Parameter name | Required | Default | Updatable | Description
@ -91,12 +97,15 @@ Method name | Requires training | Supported spaces | Description
Parameter name | Required | Default | Updatable | Description
:--- | :--- | :--- | :--- | :---
`ef_construction` | false | 512 | false | The size of the dynamic list used during k-NN graph creation. Higher values lead to a more accurate graph but slower indexing speed.<br>The Lucene engine uses the proprietary term "beam_width" to describe this function, which corresponds directly to "ef_construction". To be consistent throughout OpenSearch documentation, we retain the term "ef_construction" to label this parameter.
`ef_construction` | false | 100 | false | The size of the dynamic list used during k-NN graph creation. Higher values result in a more accurate graph but slower indexing speed.<br>The Lucene engine uses the proprietary term "beam_width" to describe this function, which corresponds directly to "ef_construction". To be consistent throughout the OpenSearch documentation, we retain the term "ef_construction" for this parameter.
`m` | false | 16 | false | The number of bidirectional links that the plugin creates for each new element. Increasing and decreasing this value can have a large impact on memory consumption. Keep this value between 2 and 100.<br>The Lucene engine uses the proprietary term "max_connections" to describe this function, which corresponds directly to "m". To be consistent throughout OpenSearch documentation, we retain the term "m" to label this parameter.
Lucene HNSW implementation ignores `ef_search` and dynamically sets it to the value of "k" in the search request. Therefore, there is no need to make settings for `ef_search` when using the Lucene engine.
{: .note}
An index created in OpenSearch version 2.11 or earlier will still use the old `ef_construction` value (`512`).
{: .note}
```json
{
"type": "knn_vector",
@ -251,7 +260,10 @@ At the moment, several parameters defined in the settings are in the deprecation
Setting | Default | Updatable | Description
:--- | :--- | :--- | :---
`index.knn` | false | false | Whether the index should build native library indexes for the `knn_vector` fields. If set to false, the `knn_vector` fields will be stored in doc values, but Approximate k-NN search functionality will be disabled.
`index.knn.algo_param.ef_search` | 512 | true | The size of the dynamic list used during k-NN searches. Higher values lead to more accurate but slower searches. Only available for nmslib.
`index.knn.algo_param.ef_construction` | 512 | false | Deprecated in 1.0.0. Use the [mapping parameters](https://opensearch.org/docs/latest/search-plugins/knn/knn-index/#method-definitions) to set this value instead.
`index.knn.algo_param.ef_search` | 100 | true | The size of the dynamic list used during k-NN searches. Higher values result in more accurate but slower searches. Only available for NMSLIB.
`index.knn.algo_param.ef_construction` | 100 | false | Deprecated in 1.0.0. Instead, use the [mapping parameters](https://opensearch.org/docs/latest/search-plugins/knn/knn-index/#method-definitions) to set this value.
`index.knn.algo_param.m` | 16 | false | Deprecated in 1.0.0. Use the [mapping parameters](https://opensearch.org/docs/latest/search-plugins/knn/knn-index/#method-definitions) to set this value instead.
`index.knn.space_type` | l2 | false | Deprecated in 1.0.0. Use the [mapping parameters](https://opensearch.org/docs/latest/search-plugins/knn/knn-index/#method-definitions) to set this value instead.
An index created in OpenSearch version 2.11 or earlier will still use the old `ef_construction` and `ef_search` values (`512`).
{: .note}