Merge pull request #975 from milvus-io/update-docs

update docs

API_Reference/pymilvus/v2.5.x/MilvusClient/CollectionSchema/CollectionSchema.md

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+# CollectionSchema
+
+A **CollectionSchema** instance represents the schema of a collection. A schema sketches the structure of a collection.
+
+```python
+class pymilvus.CollectionSchema
+```
+
+## Constructor
+
+Constructs the schema of a collection by defining fields, data types, and other parameters.
+
+```python
+CollectionSchema(
+    fields: list,
+    description: str
+)
+```
+
+**PARAMETERS:**
+
+- **fields** (*list*) -
+
+    **[REQUIRED]**
+
+    A list of **FieldSchema** objects that define the fields in the collection schema.
+
+    <div class="admonition note">
+
+    <p><b>what is a field schema?</b></p>
+
+    <p>A field schema represents and contains metadata for a single field, while <strong>CollectionSchema</strong> ties together a list of FieldSchema objects to define the full schema.</p>
+
+    </div>
+
+- **description** (*string*) -
+
+    The description of the schema.
+
+    If a description is not provided, it will be set to an empty string.
+
+- **kwargs** -
+
+    - **auto_id** (*bool*)
+
+        Whether allows the primary field to automatically increment.
+
+        Setting this to **True** makes the primary field automatically increment. In this case, the primary field should not be included in the data to insert to avoid errors.
+
+    - **enable_dynamic_field** (*bool*)
+
+        Whether allows Milvus saves the values of undefined fields in a dynamic field if the data being inserted into the target collection includes fields that are not defined in the collection's schema.
+
+        When you set this to **True**, Milvus and  will create a field called **$meta** to store any undefined fields and their values from the data that is inserted.
+
+        <div class="admonition note">
+
+        <p><b>what is a dynamic field?</b></p>
+
+        <p>If the data being inserted into the target collection includes fields that are not defined in the collection's schema, those fields will be saved in a dynamic field as key-value pairs.</p>
+
+        </div>
+
+    - **primary_field** (*str*)
+
+        The name of the primary field.
+
+        The value should be the name of a field listed in **fields**.
+
+        As an alternative, you can set **is_primary** when creating a **FieldSchema** object.
+
+    - **partition_key_field** (*str*)
+
+        The name of the field that serves as the partition key.
+
+        The value should be the name of a field listed in **fields**.
+
+        Setting this makes Milvus manage all partitions in the current collection.
+
+        As an alternative, you can set **is_partition_key** when creating a **FieldSchema** object.
+
+        <div class="admonition note">
+
+        <p><b>what is a partition key?</b></p>
+
+        <p>Once a field is designated as the partition key, Milvus automatically creates a partition for each unique value in this field and saves entities in these partitions accordingly.</p>
+        <p>This is particularly useful when implementing data separation based on a specific key, such as partition-oriented multi-tenancy.</p>
+        <p>As an alternative, you can set <strong>partition<em>key</em>field</strong> when creating a <strong>CollectionSchema</strong> object.</p>
+
+        </div>
+
+**RETURN TYPE:**
+
+*CollectionSchema*
+
+**RETURNS:**
+
+A **CollectionSchema** object.
+
+**EXCEPTIONS:**
+
+- **FieldsTypeException**: 
+
+    This exception will be raised when the **fields** parameter is not a list.
+
+- **FieldTypeException**: 
+
+    This exception will be raised when a field in the **fields** list is not a **FieldSchema** object.
+
+- **PrimaryKeyException:**
+
+    This exception will be raised if
+
+    - The **primary_field** parameter has been set but the value is not a string.
+
+    - The **primary_field** parameter has been set but the value is not the name of any listed fields.
+
+- **PartitionKeyException:**
+
+    This exception will be raised if 
+
+    - The **partition_key_field** parameter has been set but the value is not a string.
+
+    - The **partition_key_field** parameter has been set but the value is not the name of any listed fields.
+
+- **AutoIDException:**
+
+    - This exception will be raised if the **auto_id** parameter has been set but the value is not a boolean.
+
+## Examples
+
+```python
+from pymilvus import CollectionSchema, FieldSchema, DataType
+
+# Define fields in a schema
+primary_key = FieldSchema(
+    name="id",
+    dtype=DataType.INT64,
+    is_primary=True,
+)
+
+vector = FieldSchema(
+    name="vector",
+    dtype=DataType.FLOAT_VECTOR,
+    dim=768
+)
+
+# Construct a schema with the predefined fields
+schema = CollectionSchema(
+    fields=[primary_key, vector],
+    description="example_schema"
+)
+```
+
+## Methods
+
+The following are the methods of the `CollectionSchema` class:
+