### Checked other resources

- [X] I added a very descriptive title to this issue.
- [X] I searched the LangChain documentation with the integrated search.
- [X] I used the GitHub search to find a similar question and didn't find it.
- [X] I am sure that this is a bug in LangChain rather than my code.
- [X] The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).

### Example Code

The following code from AzureSearch class
```
def delete(self, ids: Optional[List[str]] = None, **kwargs: Any) -> bool:
        """Delete by vector ID.

        Args:
            ids: List of ids to delete.

        Returns:
            bool: True if deletion is successful,
            False otherwise.
        """
        if ids:
            res = self.client.delete_documents([{"id": i} for i in ids])
            return len(res) > 0
        else:
            return False
```
Do not use the FIELDS_ID variable defined at the top of the script therefore it doesn't allow complete override of the key field in Azure AI Search.

Simply replacing by:

```
def delete(self, ids: Optional[List[str]] = None, **kwargs: Any) -> bool:
        """Delete by vector ID.

        Args:
            ids: List of ids to delete.

        Returns:
            bool: True if deletion is successful,
            False otherwise.
        """
        if ids:
            res = self.client.delete_documents([{FIELDS_ID: i} for i in ids])
            return len(res) > 0
        else:
            return False
```
Will do the trick.

### Error Message and Stack Trace (if applicable)

_No response_

### Description

I'm using langchain to interact with Azure AISearch , as I want to remove documents based on their id (the key field in AISearch) I would like Langchain to offer override capabilities for this field

### System Info

No specific info
AzureSearch delete method does not use the variable FIELDS_ID therefore it does not override the value
This is a GitHub Issue
repo:langchain
owner:hwchase17
Title : AzureSearch delete method does not use the variable FIELDS_ID therefore it does not override the value
Issue date:

--- start body ---
### Checked other resources

- [X] I added a very descriptive title to this issue.
- [X] I searched the LangChain documentation with the integrated search.
- [X] I used the GitHub search to find a similar question and didn't find it.
- [X] I am sure that this is a bug in LangChain rather than my code.
- [X] The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).

### Example Code

The following code from AzureSearch class
```
def delete(self, ids: Optional[List[str]] = None, **kwargs: Any) -> bool:
        """Delete by vector ID.

        Args:
            ids: List of ids to delete.

        Returns:
            bool: True if deletion is successful,
            False otherwise.
        """
        if ids:
            res = self.client.delete_documents([{"id": i} for i in ids])
            return len(res) > 0
        else:
            return False
```
Do not use the FIELDS_ID variable defined at the top of the script therefore it doesn't allow complete override of the key field in Azure AI Search.

Simply replacing by:

```
def delete(self, ids: Optional[List[str]] = None, **kwargs: Any) -> bool:
        """Delete by vector ID.

        Args:
            ids: List of ids to delete.

        Returns:
            bool: True if deletion is successful,
            False otherwise.
        """
        if ids:
            res = self.client.delete_documents([{FIELDS_ID: i} for i in ids])
            return len(res) > 0
        else:
            return False
```
Will do the trick.

### Error Message and Stack Trace (if applicable)

_No response_

### Description

I'm using langchain to interact with Azure AISearch , as I want to remove documents based on their id (the key field in AISearch) I would like Langchain to offer override capabilities for this field

### System Info

No specific info
--- end body ---
